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/wp-includes/ -> post-template.php (source)

   1  <?php
   2  /**
   3   * WordPress Post Template Functions.
   4   *
   5   * Gets content for the current post in the loop.
   6   *
   7   * @package WordPress
   8   * @subpackage Template
   9   */
  10  
  11  /**
  12   * Display the ID of the current item in the WordPress Loop.
  13   *
  14   * @since 0.71
  15   */
  16  function the_ID() {
  17      echo get_the_ID();
  18  }
  19  
  20  /**
  21   * Retrieve the ID of the current item in the WordPress Loop.
  22   *
  23   * @since 2.1.0
  24   * @uses $post
  25   *
  26   * @return int
  27   */
  28  function get_the_ID() {
  29      return get_post()->ID;
  30  }
  31  
  32  /**
  33   * Display or retrieve the current post title with optional content.
  34   *
  35   * @since 0.71
  36   *
  37   * @param string $before Optional. Content to prepend to the title.
  38   * @param string $after Optional. Content to append to the title.
  39   * @param bool $echo Optional, default to true.Whether to display or return.
  40   * @return null|string Null on no title. String if $echo parameter is false.
  41   */
  42  function the_title($before = '', $after = '', $echo = true) {
  43      $title = get_the_title();
  44  
  45      if ( strlen($title) == 0 )
  46          return;
  47  
  48      $title = $before . $title . $after;
  49  
  50      if ( $echo )
  51          echo $title;
  52      else
  53          return $title;
  54  }
  55  
  56  /**
  57   * Sanitize the current title when retrieving or displaying.
  58   *
  59   * Works like {@link the_title()}, except the parameters can be in a string or
  60   * an array. See the function for what can be override in the $args parameter.
  61   *
  62   * The title before it is displayed will have the tags stripped and {@link
  63   * esc_attr()} before it is passed to the user or displayed. The default
  64   * as with {@link the_title()}, is to display the title.
  65   *
  66   * @since 2.3.0
  67   *
  68   * @param string|array $args Optional. Override the defaults.
  69   * @return string|null Null on failure or display. String when echo is false.
  70   */
  71  function the_title_attribute( $args = '' ) {
  72      $defaults = array('before' => '', 'after' =>  '', 'echo' => true, 'post' => get_post() );
  73      $r = wp_parse_args($args, $defaults);
  74      extract( $r, EXTR_SKIP );
  75  
  76      $title = get_the_title( $post );
  77  
  78      if ( strlen($title) == 0 )
  79          return;
  80  
  81      $title = $before . $title . $after;
  82      $title = esc_attr(strip_tags($title));
  83  
  84      if ( $echo )
  85          echo $title;
  86      else
  87          return $title;
  88  }
  89  
  90  /**
  91   * Retrieve post title.
  92   *
  93   * If the post is protected and the visitor is not an admin, then "Protected"
  94   * will be displayed before the post title. If the post is private, then
  95   * "Private" will be located before the post title.
  96   *
  97   * @since 0.71
  98   *
  99   * @param int|object $post Optional. Post ID or object.
 100   * @return string
 101   */
 102  function get_the_title( $post = 0 ) {
 103      $post = get_post( $post );
 104  
 105      $title = isset( $post->post_title ) ? $post->post_title : '';
 106      $id = isset( $post->ID ) ? $post->ID : 0;
 107  
 108      if ( ! is_admin() ) {
 109          if ( ! empty( $post->post_password ) ) {
 110              $protected_title_format = apply_filters( 'protected_title_format', __( 'Protected: %s' ) );
 111              $title = sprintf( $protected_title_format, $title );
 112          } else if ( isset( $post->post_status ) && 'private' == $post->post_status ) {
 113              $private_title_format = apply_filters( 'private_title_format', __( 'Private: %s' ) );
 114              $title = sprintf( $private_title_format, $title );
 115          }
 116      }
 117  
 118      return apply_filters( 'the_title', $title, $id );
 119  }
 120  
 121  /**
 122   * Display the Post Global Unique Identifier (guid).
 123   *
 124   * The guid will appear to be a link, but should not be used as an link to the
 125   * post. The reason you should not use it as a link, is because of moving the
 126   * blog across domains.
 127   *
 128   * Url is escaped to make it xml safe
 129   *
 130   * @since 1.5.0
 131   *
 132   * @param int $id Optional. Post ID.
 133   */
 134  function the_guid( $id = 0 ) {
 135      echo esc_url( get_the_guid( $id ) );
 136  }
 137  
 138  /**
 139   * Retrieve the Post Global Unique Identifier (guid).
 140   *
 141   * The guid will appear to be a link, but should not be used as an link to the
 142   * post. The reason you should not use it as a link, is because of moving the
 143   * blog across domains.
 144   *
 145   * @since 1.5.0
 146   *
 147   * @param int $id Optional. Post ID.
 148   * @return string
 149   */
 150  function get_the_guid( $id = 0 ) {
 151      $post = get_post($id);
 152  
 153      return apply_filters('get_the_guid', $post->guid);
 154  }
 155  
 156  /**
 157   * Display the post content.
 158   *
 159   * @since 0.71
 160   *
 161   * @param string $more_link_text Optional. Content for when there is more text.
 162   * @param bool $strip_teaser Optional. Strip teaser content before the more text. Default is false.
 163   */
 164  function the_content( $more_link_text = null, $strip_teaser = false) {
 165      $content = get_the_content( $more_link_text, $strip_teaser );
 166      $content = apply_filters( 'the_content', $content );
 167      $content = str_replace( ']]>', ']]&gt;', $content );
 168      echo $content;
 169  }
 170  
 171  /**
 172   * Retrieve the post content.
 173   *
 174   * @since 0.71
 175   *
 176   * @param string $more_link_text Optional. Content for when there is more text.
 177   * @param bool $stripteaser Optional. Strip teaser content before the more text. Default is false.
 178   * @return string
 179   */
 180  function get_the_content( $more_link_text = null, $strip_teaser = false ) {
 181      global $page, $more, $preview, $pages, $multipage;
 182  
 183      $post = get_post();
 184  
 185      if ( null === $more_link_text )
 186          $more_link_text = __( '(more&hellip;)' );
 187  
 188      $output = '';
 189      $has_teaser = false;
 190  
 191      // If post password required and it doesn't match the cookie.
 192      if ( post_password_required( $post ) )
 193          return get_the_password_form( $post );
 194  
 195      if ( $page > count( $pages ) ) // if the requested page doesn't exist
 196          $page = count( $pages ); // give them the highest numbered page that DOES exist
 197  
 198      $content = $pages[$page - 1];
 199      if ( preg_match( '/<!--more(.*?)?-->/', $content, $matches ) ) {
 200          $content = explode( $matches[0], $content, 2 );
 201          if ( ! empty( $matches[1] ) && ! empty( $more_link_text ) )
 202              $more_link_text = strip_tags( wp_kses_no_null( trim( $matches[1] ) ) );
 203  
 204          $has_teaser = true;
 205      } else {
 206          $content = array( $content );
 207      }
 208  
 209      if ( false !== strpos( $post->post_content, '<!--noteaser-->' ) && ( ! $multipage || $page == 1 ) )
 210          $strip_teaser = true;
 211  
 212      $teaser = $content[0];
 213  
 214      if ( $more && $strip_teaser && $has_teaser )
 215          $teaser = '';
 216  
 217      $output .= $teaser;
 218  
 219      if ( count( $content ) > 1 ) {
 220          if ( $more ) {
 221              $output .= '<span id="more-' . $post->ID . '"></span>' . $content[1];
 222          } else {
 223              if ( ! empty( $more_link_text ) )
 224                  $output .= apply_filters( 'the_content_more_link', ' <a href="' . get_permalink() . "#more-{$post->ID}\" class=\"more-link\">$more_link_text</a>", $more_link_text );
 225              $output = force_balance_tags( $output );
 226          }
 227      }
 228  
 229      if ( $preview ) // preview fix for javascript bug with foreign languages
 230          $output =    preg_replace_callback( '/\%u([0-9A-F]{4})/', '_convert_urlencoded_to_entities', $output );
 231  
 232      return $output;
 233  }
 234  
 235  /**
 236   * Preview fix for javascript bug with foreign languages
 237   *
 238   * @since 3.1.0
 239   * @access private
 240   * @param array $match Match array from preg_replace_callback
 241   * @return string
 242   */
 243  function _convert_urlencoded_to_entities( $match ) {
 244      return '&#' . base_convert( $match[1], 16, 10 ) . ';';
 245  }
 246  
 247  /**
 248   * Display the post excerpt.
 249   *
 250   * @since 0.71
 251   * @uses apply_filters() Calls 'the_excerpt' hook on post excerpt.
 252   */
 253  function the_excerpt() {
 254      echo apply_filters('the_excerpt', get_the_excerpt());
 255  }
 256  
 257  /**
 258   * Retrieve the post excerpt.
 259   *
 260   * @since 0.71
 261   *
 262   * @param mixed $deprecated Not used.
 263   * @return string
 264   */
 265  function get_the_excerpt( $deprecated = '' ) {
 266      if ( !empty( $deprecated ) )
 267          _deprecated_argument( __FUNCTION__, '2.3' );
 268  
 269      $post = get_post();
 270  
 271      if ( post_password_required() ) {
 272          return __( 'There is no excerpt because this is a protected post.' );
 273      }
 274  
 275      return apply_filters( 'get_the_excerpt', $post->post_excerpt );
 276  }
 277  
 278  /**
 279   * Whether post has excerpt.
 280   *
 281   * @since 2.3.0
 282   *
 283   * @param int $id Optional. Post ID.
 284   * @return bool
 285   */
 286  function has_excerpt( $id = 0 ) {
 287      $post = get_post( $id );
 288      return ( !empty( $post->post_excerpt ) );
 289  }
 290  
 291  /**
 292   * Display the classes for the post div.
 293   *
 294   * @since 2.7.0
 295   *
 296   * @param string|array $class One or more classes to add to the class list.
 297   * @param int $post_id An optional post ID.
 298   */
 299  function post_class( $class = '', $post_id = null ) {
 300      // Separates classes with a single space, collates classes for post DIV
 301      echo 'class="' . join( ' ', get_post_class( $class, $post_id ) ) . '"';
 302  }
 303  
 304  /**
 305   * Retrieve the classes for the post div as an array.
 306   *
 307   * The class names are add are many. If the post is a sticky, then the 'sticky'
 308   * class name. The class 'hentry' is always added to each post. For each
 309   * category, the class will be added with 'category-' with category slug is
 310   * added. The tags are the same way as the categories with 'tag-' before the tag
 311   * slug. All classes are passed through the filter, 'post_class' with the list
 312   * of classes, followed by $class parameter value, with the post ID as the last
 313   * parameter.
 314   *
 315   * @since 2.7.0
 316   *
 317   * @param string|array $class One or more classes to add to the class list.
 318   * @param int $post_id An optional post ID.
 319   * @return array Array of classes.
 320   */
 321  function get_post_class( $class = '', $post_id = null ) {
 322      $post = get_post($post_id);
 323  
 324      $classes = array();
 325  
 326      if ( empty($post) )
 327          return $classes;
 328  
 329      $classes[] = 'post-' . $post->ID;
 330      if ( ! is_admin() )
 331          $classes[] = $post->post_type;
 332      $classes[] = 'type-' . $post->post_type;
 333      $classes[] = 'status-' . $post->post_status;
 334  
 335      // Post Format
 336      if ( post_type_supports( $post->post_type, 'post-formats' ) ) {
 337          $post_format = get_post_format( $post->ID );
 338  
 339          if ( $post_format && !is_wp_error($post_format) )
 340              $classes[] = 'format-' . sanitize_html_class( $post_format );
 341          else
 342              $classes[] = 'format-standard';
 343      }
 344  
 345      // post requires password
 346      if ( post_password_required($post->ID) )
 347          $classes[] = 'post-password-required';
 348  
 349      // sticky for Sticky Posts
 350      if ( is_sticky($post->ID) && is_home() && !is_paged() )
 351          $classes[] = 'sticky';
 352  
 353      // hentry for hAtom compliance
 354      $classes[] = 'hentry';
 355  
 356      // Categories
 357      if ( is_object_in_taxonomy( $post->post_type, 'category' ) ) {
 358          foreach ( (array) get_the_category($post->ID) as $cat ) {
 359              if ( empty($cat->slug ) )
 360                  continue;
 361              $classes[] = 'category-' . sanitize_html_class($cat->slug, $cat->term_id);
 362          }
 363      }
 364  
 365      // Tags
 366      if ( is_object_in_taxonomy( $post->post_type, 'post_tag' ) ) {
 367          foreach ( (array) get_the_tags($post->ID) as $tag ) {
 368              if ( empty($tag->slug ) )
 369                  continue;
 370              $classes[] = 'tag-' . sanitize_html_class($tag->slug, $tag->term_id);
 371          }
 372      }
 373  
 374      if ( !empty($class) ) {
 375          if ( !is_array( $class ) )
 376              $class = preg_split('#\s+#', $class);
 377          $classes = array_merge($classes, $class);
 378      }
 379  
 380      $classes = array_map('esc_attr', $classes);
 381  
 382      return apply_filters('post_class', $classes, $class, $post->ID);
 383  }
 384  
 385  /**
 386   * Display the classes for the body element.
 387   *
 388   * @since 2.8.0
 389   *
 390   * @param string|array $class One or more classes to add to the class list.
 391   */
 392  function body_class( $class = '' ) {
 393      // Separates classes with a single space, collates classes for body element
 394      echo 'class="' . join( ' ', get_body_class( $class ) ) . '"';
 395  }
 396  
 397  /**
 398   * Retrieve the classes for the body element as an array.
 399   *
 400   * @since 2.8.0
 401   *
 402   * @param string|array $class One or more classes to add to the class list.
 403   * @return array Array of classes.
 404   */
 405  function get_body_class( $class = '' ) {
 406      global $wp_query, $wpdb;
 407  
 408      $classes = array();
 409  
 410      if ( is_rtl() )
 411          $classes[] = 'rtl';
 412  
 413      if ( is_front_page() )
 414          $classes[] = 'home';
 415      if ( is_home() )
 416          $classes[] = 'blog';
 417      if ( is_archive() )
 418          $classes[] = 'archive';
 419      if ( is_date() )
 420          $classes[] = 'date';
 421      if ( is_search() ) {
 422          $classes[] = 'search';
 423          $classes[] = $wp_query->posts ? 'search-results' : 'search-no-results';
 424      }
 425      if ( is_paged() )
 426          $classes[] = 'paged';
 427      if ( is_attachment() )
 428          $classes[] = 'attachment';
 429      if ( is_404() )
 430          $classes[] = 'error404';
 431  
 432      if ( is_single() ) {
 433          $post_id = $wp_query->get_queried_object_id();
 434          $post = $wp_query->get_queried_object();
 435  
 436          $classes[] = 'single';
 437          if ( isset( $post->post_type ) ) {
 438              $classes[] = 'single-' . sanitize_html_class($post->post_type, $post_id);
 439              $classes[] = 'postid-' . $post_id;
 440  
 441              // Post Format
 442              if ( post_type_supports( $post->post_type, 'post-formats' ) ) {
 443                  $post_format = get_post_format( $post->ID );
 444  
 445                  if ( $post_format && !is_wp_error($post_format) )
 446                      $classes[] = 'single-format-' . sanitize_html_class( $post_format );
 447                  else
 448                      $classes[] = 'single-format-standard';
 449              }
 450          }
 451  
 452          if ( is_attachment() ) {
 453              $mime_type = get_post_mime_type($post_id);
 454              $mime_prefix = array( 'application/', 'image/', 'text/', 'audio/', 'video/', 'music/' );
 455              $classes[] = 'attachmentid-' . $post_id;
 456              $classes[] = 'attachment-' . str_replace( $mime_prefix, '', $mime_type );
 457          }
 458      } elseif ( is_archive() ) {
 459          if ( is_post_type_archive() ) {
 460              $classes[] = 'post-type-archive';
 461              $post_type = get_query_var( 'post_type' );
 462              if ( is_array( $post_type ) )
 463                  $post_type = reset( $post_type );
 464              $classes[] = 'post-type-archive-' . sanitize_html_class( $post_type );
 465          } else if ( is_author() ) {
 466              $author = $wp_query->get_queried_object();
 467              $classes[] = 'author';
 468              if ( isset( $author->user_nicename ) ) {
 469                  $classes[] = 'author-' . sanitize_html_class( $author->user_nicename, $author->ID );
 470                  $classes[] = 'author-' . $author->ID;
 471              }
 472          } elseif ( is_category() ) {
 473              $cat = $wp_query->get_queried_object();
 474              $classes[] = 'category';
 475              if ( isset( $cat->term_id ) ) {
 476                  $classes[] = 'category-' . sanitize_html_class( $cat->slug, $cat->term_id );
 477                  $classes[] = 'category-' . $cat->term_id;
 478              }
 479          } elseif ( is_tag() ) {
 480              $tags = $wp_query->get_queried_object();
 481              $classes[] = 'tag';
 482              if ( isset( $tags->term_id ) ) {
 483                  $classes[] = 'tag-' . sanitize_html_class( $tags->slug, $tags->term_id );
 484                  $classes[] = 'tag-' . $tags->term_id;
 485              }
 486          } elseif ( is_tax() ) {
 487              $term = $wp_query->get_queried_object();
 488              if ( isset( $term->term_id ) ) {
 489                  $classes[] = 'tax-' . sanitize_html_class( $term->taxonomy );
 490                  $classes[] = 'term-' . sanitize_html_class( $term->slug, $term->term_id );
 491                  $classes[] = 'term-' . $term->term_id;
 492              }
 493          }
 494      } elseif ( is_page() ) {
 495          $classes[] = 'page';
 496  
 497          $page_id = $wp_query->get_queried_object_id();
 498  
 499          $post = get_post($page_id);
 500  
 501          $classes[] = 'page-id-' . $page_id;
 502  
 503          if ( $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'page' AND post_status = 'publish' LIMIT 1", $page_id) ) )
 504              $classes[] = 'page-parent';
 505  
 506          if ( $post->post_parent ) {
 507              $classes[] = 'page-child';
 508              $classes[] = 'parent-pageid-' . $post->post_parent;
 509          }
 510          if ( is_page_template() ) {
 511              $classes[] = 'page-template';
 512              $classes[] = 'page-template-' . sanitize_html_class( str_replace( '.', '-', get_page_template_slug( $page_id ) ) );
 513          } else {
 514              $classes[] = 'page-template-default';
 515          }
 516      }
 517  
 518      if ( is_user_logged_in() )
 519          $classes[] = 'logged-in';
 520  
 521      if ( is_admin_bar_showing() ) {
 522          $classes[] = 'admin-bar';
 523          $classes[] = 'no-customize-support';
 524      }
 525  
 526      if ( get_theme_mod( 'background_color' ) || get_background_image() )
 527          $classes[] = 'custom-background';
 528  
 529      $page = $wp_query->get( 'page' );
 530  
 531      if ( !$page || $page < 2)
 532          $page = $wp_query->get( 'paged' );
 533  
 534      if ( $page && $page > 1 ) {
 535          $classes[] = 'paged-' . $page;
 536  
 537          if ( is_single() )
 538              $classes[] = 'single-paged-' . $page;
 539          elseif ( is_page() )
 540              $classes[] = 'page-paged-' . $page;
 541          elseif ( is_category() )
 542              $classes[] = 'category-paged-' . $page;
 543          elseif ( is_tag() )
 544              $classes[] = 'tag-paged-' . $page;
 545          elseif ( is_date() )
 546              $classes[] = 'date-paged-' . $page;
 547          elseif ( is_author() )
 548              $classes[] = 'author-paged-' . $page;
 549          elseif ( is_search() )
 550              $classes[] = 'search-paged-' . $page;
 551          elseif ( is_post_type_archive() )
 552              $classes[] = 'post-type-paged-' . $page;
 553      }
 554  
 555      if ( ! empty( $class ) ) {
 556          if ( !is_array( $class ) )
 557              $class = preg_split( '#\s+#', $class );
 558          $classes = array_merge( $classes, $class );
 559      } else {
 560          // Ensure that we always coerce class to being an array.
 561          $class = array();
 562      }
 563  
 564      $classes = array_map( 'esc_attr', $classes );
 565  
 566      return apply_filters( 'body_class', $classes, $class );
 567  }
 568  
 569  /**
 570   * Whether post requires password and correct password has been provided.
 571   *
 572   * @since 2.7.0
 573   *
 574   * @param int|WP_Post $post An optional post. Global $post used if not provided.
 575   * @return bool false if a password is not required or the correct password cookie is present, true otherwise.
 576   */
 577  function post_password_required( $post = null ) {
 578      $post = get_post($post);
 579  
 580      if ( empty( $post->post_password ) )
 581          return false;
 582  
 583      if ( ! isset( $_COOKIE['wp-postpass_' . COOKIEHASH] ) )
 584          return true;
 585  
 586      require_once  ABSPATH . 'wp-includes/class-phpass.php';
 587      $hasher = new PasswordHash( 8, true );
 588  
 589      $hash = wp_unslash( $_COOKIE[ 'wp-postpass_' . COOKIEHASH ] );
 590      if ( 0 !== strpos( $hash, '$P$B' ) )
 591          return true;
 592  
 593      return ! $hasher->CheckPassword( $post->post_password, $hash );
 594  }
 595  
 596  /**
 597   * Page Template Functions for usage in Themes
 598   *
 599   * @package WordPress
 600   * @subpackage Template
 601   */
 602  
 603  /**
 604   * The formatted output of a list of pages.
 605   *
 606   * Displays page links for paginated posts (i.e. includes the <!--nextpage-->.
 607   * Quicktag one or more times). This tag must be within The Loop.
 608   *
 609   * The defaults for overwriting are:
 610   * 'before' - Default is '<p> Pages:' (string). The html or text to prepend to
 611   *      each bookmarks.
 612   * 'after' - Default is '</p>' (string). The html or text to append to each
 613   *      bookmarks.
 614   * 'link_before' - Default is '' (string). The html or text to prepend to each
 615   *      Pages link inside the <a> tag. Also prepended to the current item, which
 616   *      is not linked.
 617   * 'link_after' - Default is '' (string). The html or text to append to each
 618   *      Pages link inside the <a> tag. Also appended to the current item, which
 619   *      is not linked.
 620   * 'next_or_number' - Default is 'number' (string). Indicates whether page
 621   *      numbers should be used. Valid values are number and next.
 622   * 'separator' - Default is ' ' (string). Text used between pagination links.
 623   * 'nextpagelink' - Default is 'Next Page' (string). Text for link to next page.
 624   *      of the bookmark.
 625   * 'previouspagelink' - Default is 'Previous Page' (string). Text for link to
 626   *      previous page, if available.
 627   * 'pagelink' - Default is '%' (String).Format string for page numbers. The % in
 628   *      the parameter string will be replaced with the page number, so Page %
 629   *      generates "Page 1", "Page 2", etc. Defaults to %, just the page number.
 630   * 'echo' - Default is 1 (integer). When not 0, this triggers the HTML to be
 631   *      echoed and then returned.
 632   *
 633   * @since 1.2.0
 634   *
 635   * @param string|array $args Optional. Overwrite the defaults.
 636   * @return string Formatted output in HTML.
 637   */
 638  function wp_link_pages( $args = '' ) {
 639      $defaults = array(
 640          'before'           => '<p>' . __( 'Pages:' ),
 641          'after'            => '</p>',
 642          'link_before'      => '',
 643          'link_after'       => '',
 644          'next_or_number'   => 'number',
 645          'separator'        => ' ',
 646          'nextpagelink'     => __( 'Next page' ),
 647          'previouspagelink' => __( 'Previous page' ),
 648          'pagelink'         => '%',
 649          'echo'             => 1
 650      );
 651  
 652      $r = wp_parse_args( $args, $defaults );
 653      $r = apply_filters( 'wp_link_pages_args', $r );
 654      extract( $r, EXTR_SKIP );
 655  
 656      global $page, $numpages, $multipage, $more;
 657  
 658      $output = '';
 659      if ( $multipage ) {
 660          if ( 'number' == $next_or_number ) {
 661              $output .= $before;
 662              for ( $i = 1; $i <= $numpages; $i++ ) {
 663                  $link = $link_before . str_replace( '%', $i, $pagelink ) . $link_after;
 664                  if ( $i != $page || ! $more && 1 == $page )
 665                      $link = _wp_link_page( $i ) . $link . '</a>';
 666                  $link = apply_filters( 'wp_link_pages_link', $link, $i );
 667                  $output .= $separator . $link;
 668              }
 669              $output .= $after;
 670          } elseif ( $more ) {
 671              $output .= $before;
 672              $i = $page - 1;
 673              if ( $i ) {
 674                  $link = _wp_link_page( $i ) . $link_before . $previouspagelink . $link_after . '</a>';
 675                  $link = apply_filters( 'wp_link_pages_link', $link, $i );
 676                  $output .= $separator . $link;
 677              }
 678              $i = $page + 1;
 679              if ( $i <= $numpages ) {
 680                  $link = _wp_link_page( $i ) . $link_before . $nextpagelink . $link_after . '</a>';
 681                  $link = apply_filters( 'wp_link_pages_link', $link, $i );
 682                  $output .= $separator . $link;
 683              }
 684              $output .= $after;
 685          }
 686      }
 687  
 688      $output = apply_filters( 'wp_link_pages', $output, $args );
 689  
 690      if ( $echo )
 691          echo $output;
 692  
 693      return $output;
 694  }
 695  
 696  /**
 697   * Helper function for wp_link_pages().
 698   *
 699   * @since 3.1.0
 700   * @access private
 701   *
 702   * @param int $i Page number.
 703   * @return string Link.
 704   */
 705  function _wp_link_page( $i ) {
 706      global $wp_rewrite;
 707      $post = get_post();
 708  
 709      if ( 1 == $i ) {
 710          $url = get_permalink();
 711      } else {
 712          if ( '' == get_option('permalink_structure') || in_array($post->post_status, array('draft', 'pending')) )
 713              $url = add_query_arg( 'page', $i, get_permalink() );
 714          elseif ( 'page' == get_option('show_on_front') && get_option('page_on_front') == $post->ID )
 715              $url = trailingslashit(get_permalink()) . user_trailingslashit("$wp_rewrite->pagination_base/" . $i, 'single_paged');
 716          else
 717              $url = trailingslashit(get_permalink()) . user_trailingslashit($i, 'single_paged');
 718      }
 719  
 720      return '<a href="' . esc_url( $url ) . '">';
 721  }
 722  
 723  //
 724  // Post-meta: Custom per-post fields.
 725  //
 726  
 727  /**
 728   * Retrieve post custom meta data field.
 729   *
 730   * @since 1.5.0
 731   *
 732   * @param string $key Meta data key name.
 733   * @return bool|string|array Array of values or single value, if only one element exists. False will be returned if key does not exist.
 734   */
 735  function post_custom( $key = '' ) {
 736      $custom = get_post_custom();
 737  
 738      if ( !isset( $custom[$key] ) )
 739          return false;
 740      elseif ( 1 == count($custom[$key]) )
 741          return $custom[$key][0];
 742      else
 743          return $custom[$key];
 744  }
 745  
 746  /**
 747   * Display list of post custom fields.
 748   *
 749   * @internal This will probably change at some point...
 750   * @since 1.2.0
 751   * @uses apply_filters() Calls 'the_meta_key' on list item HTML content, with key and value as separate parameters.
 752   */
 753  function the_meta() {
 754      if ( $keys = get_post_custom_keys() ) {
 755          echo "<ul class='post-meta'>\n";
 756          foreach ( (array) $keys as $key ) {
 757              $keyt = trim($key);
 758              if ( is_protected_meta( $keyt, 'post' ) )
 759                  continue;
 760              $values = array_map('trim', get_post_custom_values($key));
 761              $value = implode($values,', ');
 762              echo apply_filters('the_meta_key', "<li><span class='post-meta-key'>$key:</span> $value</li>\n", $key, $value);
 763          }
 764          echo "</ul>\n";
 765      }
 766  }
 767  
 768  //
 769  // Pages
 770  //
 771  
 772  /**
 773   * Retrieve or display list of pages as a dropdown (select list).
 774   *
 775   * @since 2.1.0
 776   *
 777   * @param array|string $args Optional. Override default arguments.
 778   * @return string HTML content, if not displaying.
 779   */
 780  function wp_dropdown_pages($args = '') {
 781      $defaults = array(
 782          'depth' => 0, 'child_of' => 0,
 783          'selected' => 0, 'echo' => 1,
 784          'name' => 'page_id', 'id' => '',
 785          'show_option_none' => '', 'show_option_no_change' => '',
 786          'option_none_value' => ''
 787      );
 788  
 789      $r = wp_parse_args( $args, $defaults );
 790      extract( $r, EXTR_SKIP );
 791  
 792      $pages = get_pages($r);
 793      $output = '';
 794      // Back-compat with old system where both id and name were based on $name argument
 795      if ( empty($id) )
 796          $id = $name;
 797  
 798      if ( ! empty($pages) ) {
 799          $output = "<select name='" . esc_attr( $name ) . "' id='" . esc_attr( $id ) . "'>\n";
 800          if ( $show_option_no_change )
 801              $output .= "\t<option value=\"-1\">$show_option_no_change</option>";
 802          if ( $show_option_none )
 803              $output .= "\t<option value=\"" . esc_attr($option_none_value) . "\">$show_option_none</option>\n";
 804          $output .= walk_page_dropdown_tree($pages, $depth, $r);
 805          $output .= "</select>\n";
 806      }
 807  
 808      $output = apply_filters('wp_dropdown_pages', $output);
 809  
 810      if ( $echo )
 811          echo $output;
 812  
 813      return $output;
 814  }
 815  
 816  /**
 817   * Retrieve or display list of pages in list (li) format.
 818   *
 819   * @since 1.5.0
 820   *
 821   * @param array|string $args Optional. Override default arguments.
 822   * @return string HTML content, if not displaying.
 823   */
 824  function wp_list_pages($args = '') {
 825      $defaults = array(
 826          'depth' => 0, 'show_date' => '',
 827          'date_format' => get_option('date_format'),
 828          'child_of' => 0, 'exclude' => '',
 829          'title_li' => __('Pages'), 'echo' => 1,
 830          'authors' => '', 'sort_column' => 'menu_order, post_title',
 831          'link_before' => '', 'link_after' => '', 'walker' => '',
 832      );
 833  
 834      $r = wp_parse_args( $args, $defaults );
 835      extract( $r, EXTR_SKIP );
 836  
 837      $output = '';
 838      $current_page = 0;
 839  
 840      // sanitize, mostly to keep spaces out
 841      $r['exclude'] = preg_replace('/[^0-9,]/', '', $r['exclude']);
 842  
 843      // Allow plugins to filter an array of excluded pages (but don't put a nullstring into the array)
 844      $exclude_array = ( $r['exclude'] ) ? explode(',', $r['exclude']) : array();
 845      $r['exclude'] = implode( ',', apply_filters('wp_list_pages_excludes', $exclude_array) );
 846  
 847      // Query pages.
 848      $r['hierarchical'] = 0;
 849      $pages = get_pages($r);
 850  
 851      if ( !empty($pages) ) {
 852          if ( $r['title_li'] )
 853              $output .= '<li class="pagenav">' . $r['title_li'] . '<ul>';
 854  
 855          global $wp_query;
 856          if ( is_page() || is_attachment() || $wp_query->is_posts_page )
 857              $current_page = $wp_query->get_queried_object_id();
 858          $output .= walk_page_tree($pages, $r['depth'], $current_page, $r);
 859  
 860          if ( $r['title_li'] )
 861              $output .= '</ul></li>';
 862      }
 863  
 864      $output = apply_filters('wp_list_pages', $output, $r);
 865  
 866      if ( $r['echo'] )
 867          echo $output;
 868      else
 869          return $output;
 870  }
 871  
 872  /**
 873   * Display or retrieve list of pages with optional home link.
 874   *
 875   * The arguments are listed below and part of the arguments are for {@link
 876   * wp_list_pages()} function. Check that function for more info on those
 877   * arguments.
 878   *
 879   * <ul>
 880   * <li><strong>sort_column</strong> - How to sort the list of pages. Defaults
 881   * to 'menu_order, post_title'. Use column for posts table.</li>
 882   * <li><strong>menu_class</strong> - Class to use for the div ID which contains
 883   * the page list. Defaults to 'menu'.</li>
 884   * <li><strong>echo</strong> - Whether to echo list or return it. Defaults to
 885   * echo.</li>
 886   * <li><strong>link_before</strong> - Text before show_home argument text.</li>
 887   * <li><strong>link_after</strong> - Text after show_home argument text.</li>
 888   * <li><strong>show_home</strong> - If you set this argument, then it will
 889   * display the link to the home page. The show_home argument really just needs
 890   * to be set to the value of the text of the link.</li>
 891   * </ul>
 892   *
 893   * @since 2.7.0
 894   *
 895   * @param array|string $args
 896   * @return string html menu
 897   */
 898  function wp_page_menu( $args = array() ) {
 899      $defaults = array('sort_column' => 'menu_order, post_title', 'menu_class' => 'menu', 'echo' => true, 'link_before' => '', 'link_after' => '');
 900      $args = wp_parse_args( $args, $defaults );
 901      $args = apply_filters( 'wp_page_menu_args', $args );
 902  
 903      $menu = '';
 904  
 905      $list_args = $args;
 906  
 907      // Show Home in the menu
 908      if ( ! empty($args['show_home']) ) {
 909          if ( true === $args['show_home'] || '1' === $args['show_home'] || 1 === $args['show_home'] )
 910              $text = __('Home');
 911          else
 912              $text = $args['show_home'];
 913          $class = '';
 914          if ( is_front_page() && !is_paged() )
 915              $class = 'class="current_page_item"';
 916          $menu .= '<li ' . $class . '><a href="' . home_url( '/' ) . '">' . $args['link_before'] . $text . $args['link_after'] . '</a></li>';
 917          // If the front page is a page, add it to the exclude list
 918          if (get_option('show_on_front') == 'page') {
 919              if ( !empty( $list_args['exclude'] ) ) {
 920                  $list_args['exclude'] .= ',';
 921              } else {
 922                  $list_args['exclude'] = '';
 923              }
 924              $list_args['exclude'] .= get_option('page_on_front');
 925          }
 926      }
 927  
 928      $list_args['echo'] = false;
 929      $list_args['title_li'] = '';
 930      $menu .= str_replace( array( "\r", "\n", "\t" ), '', wp_list_pages($list_args) );
 931  
 932      if ( $menu )
 933          $menu = '<ul>' . $menu . '</ul>';
 934  
 935      $menu = '<div class="' . esc_attr($args['menu_class']) . '">' . $menu . "</div>\n";
 936      $menu = apply_filters( 'wp_page_menu', $menu, $args );
 937      if ( $args['echo'] )
 938          echo $menu;
 939      else
 940          return $menu;
 941  }
 942  
 943  //
 944  // Page helpers
 945  //
 946  
 947  /**
 948   * Retrieve HTML list content for page list.
 949   *
 950   * @uses Walker_Page to create HTML list content.
 951   * @since 2.1.0
 952   * @see Walker_Page::walk() for parameters and return description.
 953   */
 954  function walk_page_tree($pages, $depth, $current_page, $r) {
 955      if ( empty($r['walker']) )
 956          $walker = new Walker_Page;
 957      else
 958          $walker = $r['walker'];
 959  
 960      foreach ( (array) $pages as $page ) {
 961          if ( $page->post_parent )
 962              $r['pages_with_children'][ $page->post_parent ] = true;
 963      }
 964  
 965      $args = array($pages, $depth, $r, $current_page);
 966      return call_user_func_array(array($walker, 'walk'), $args);
 967  }
 968  
 969  /**
 970   * Retrieve HTML dropdown (select) content for page list.
 971   *
 972   * @uses Walker_PageDropdown to create HTML dropdown content.
 973   * @since 2.1.0
 974   * @see Walker_PageDropdown::walk() for parameters and return description.
 975   */
 976  function walk_page_dropdown_tree() {
 977      $args = func_get_args();
 978      if ( empty($args[2]['walker']) ) // the user's options are the third parameter
 979          $walker = new Walker_PageDropdown;
 980      else
 981          $walker = $args[2]['walker'];
 982  
 983      return call_user_func_array(array($walker, 'walk'), $args);
 984  }
 985  
 986  /**
 987   * Create HTML list of pages.
 988   *
 989   * @package WordPress
 990   * @since 2.1.0
 991   * @uses Walker
 992   */
 993  class Walker_Page extends Walker {
 994      /**
 995       * @see Walker::$tree_type
 996       * @since 2.1.0
 997       * @var string
 998       */
 999      var $tree_type = 'page';
1000  
1001      /**
1002       * @see Walker::$db_fields
1003       * @since 2.1.0
1004       * @todo Decouple this.
1005       * @var array
1006       */
1007      var $db_fields = array ('parent' => 'post_parent', 'id' => 'ID');
1008  
1009      /**
1010       * @see Walker::start_lvl()
1011       * @since 2.1.0
1012       *
1013       * @param string $output Passed by reference. Used to append additional content.
1014       * @param int $depth Depth of page. Used for padding.
1015       * @param array $args
1016       */
1017  	function start_lvl( &$output, $depth = 0, $args = array() ) {
1018          $indent = str_repeat("\t", $depth);
1019          $output .= "\n$indent<ul class='children'>\n";
1020      }
1021  
1022      /**
1023       * @see Walker::end_lvl()
1024       * @since 2.1.0
1025       *
1026       * @param string $output Passed by reference. Used to append additional content.
1027       * @param int $depth Depth of page. Used for padding.
1028       * @param array $args
1029       */
1030  	function end_lvl( &$output, $depth = 0, $args = array() ) {
1031          $indent = str_repeat("\t", $depth);
1032          $output .= "$indent</ul>\n";
1033      }
1034  
1035      /**
1036       * @see Walker::start_el()
1037       * @since 2.1.0
1038       *
1039       * @param string $output Passed by reference. Used to append additional content.
1040       * @param object $page Page data object.
1041       * @param int $depth Depth of page. Used for padding.
1042       * @param int $current_page Page ID.
1043       * @param array $args
1044       */
1045  	function start_el( &$output, $page, $depth = 0, $args = array(), $current_page = 0 ) {
1046          if ( $depth )
1047              $indent = str_repeat("\t", $depth);
1048          else
1049              $indent = '';
1050  
1051          extract($args, EXTR_SKIP);
1052          $css_class = array('page_item', 'page-item-'.$page->ID);
1053  
1054          if( isset( $args['pages_with_children'][ $page->ID ] ) )
1055              $css_class[] = 'page_item_has_children';
1056  
1057          if ( !empty($current_page) ) {
1058              $_current_page = get_post( $current_page );
1059              if ( in_array( $page->ID, $_current_page->ancestors ) )
1060                  $css_class[] = 'current_page_ancestor';
1061              if ( $page->ID == $current_page )
1062                  $css_class[] = 'current_page_item';
1063              elseif ( $_current_page && $page->ID == $_current_page->post_parent )
1064                  $css_class[] = 'current_page_parent';
1065          } elseif ( $page->ID == get_option('page_for_posts') ) {
1066              $css_class[] = 'current_page_parent';
1067          }
1068  
1069          $css_class = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page ) );
1070  
1071          if ( '' === $page->post_title )
1072              $page->post_title = sprintf( __( '#%d (no title)' ), $page->ID );
1073  
1074          /** This filter is documented in wp-includes/post-template.php */
1075          $output .= $indent . '<li class="' . $css_class . '"><a href="' . get_permalink($page->ID) . '">' . $link_before . apply_filters( 'the_title', $page->post_title, $page->ID ) . $link_after . '</a>';
1076  
1077          if ( !empty($show_date) ) {
1078              if ( 'modified' == $show_date )
1079                  $time = $page->post_modified;
1080              else
1081                  $time = $page->post_date;
1082  
1083              $output .= " " . mysql2date($date_format, $time);
1084          }
1085      }
1086  
1087      /**
1088       * @see Walker::end_el()
1089       * @since 2.1.0
1090       *
1091       * @param string $output Passed by reference. Used to append additional content.
1092       * @param object $page Page data object. Not used.
1093       * @param int $depth Depth of page. Not Used.
1094       * @param array $args
1095       */
1096  	function end_el( &$output, $page, $depth = 0, $args = array() ) {
1097          $output .= "</li>\n";
1098      }
1099  
1100  }
1101  
1102  /**
1103   * Create HTML dropdown list of pages.
1104   *
1105   * @package WordPress
1106   * @since 2.1.0
1107   * @uses Walker
1108   */
1109  class Walker_PageDropdown extends Walker {
1110      /**
1111       * @see Walker::$tree_type
1112       * @since 2.1.0
1113       * @var string
1114       */
1115      var $tree_type = 'page';
1116  
1117      /**
1118       * @see Walker::$db_fields
1119       * @since 2.1.0
1120       * @todo Decouple this
1121       * @var array
1122       */
1123      var $db_fields = array ('parent' => 'post_parent', 'id' => 'ID');
1124  
1125      /**
1126       * @see Walker::start_el()
1127       * @since 2.1.0
1128       *
1129       * @param string $output Passed by reference. Used to append additional content.
1130       * @param object $page Page data object.
1131       * @param int $depth Depth of page in reference to parent pages. Used for padding.
1132       * @param array $args Uses 'selected' argument for selected page to set selected HTML attribute for option element.
1133       * @param int $id
1134       */
1135  	function start_el( &$output, $page, $depth = 0, $args = array(), $id = 0 ) {
1136          $pad = str_repeat('&nbsp;', $depth * 3);
1137  
1138          $output .= "\t<option class=\"level-$depth\" value=\"$page->ID\"";
1139          if ( $page->ID == $args['selected'] )
1140              $output .= ' selected="selected"';
1141          $output .= '>';
1142          $title = apply_filters( 'list_pages', $page->post_title, $page );
1143          $output .= $pad . esc_html( $title );
1144          $output .= "</option>\n";
1145      }
1146  }
1147  
1148  //
1149  // Attachments
1150  //
1151  
1152  /**
1153   * Display an attachment page link using an image or icon.
1154   *
1155   * @since 2.0.0
1156   *
1157   * @param int $id Optional. Post ID.
1158   * @param bool $fullsize Optional, default is false. Whether to use full size.
1159   * @param bool $deprecated Deprecated. Not used.
1160   * @param bool $permalink Optional, default is false. Whether to include permalink.
1161   */
1162  function the_attachment_link( $id = 0, $fullsize = false, $deprecated = false, $permalink = false ) {
1163      if ( !empty( $deprecated ) )
1164          _deprecated_argument( __FUNCTION__, '2.5' );
1165  
1166      if ( $fullsize )
1167          echo wp_get_attachment_link($id, 'full', $permalink);
1168      else
1169          echo wp_get_attachment_link($id, 'thumbnail', $permalink);
1170  }
1171  
1172  /**
1173   * Retrieve an attachment page link using an image or icon, if possible.
1174   *
1175   * @since 2.5.0
1176   * @uses apply_filters() Calls 'wp_get_attachment_link' filter on HTML content with same parameters as function.
1177   *
1178   * @param int $id Optional. Post ID.
1179   * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string.
1180   * @param bool $permalink Optional, default is false. Whether to add permalink to image.
1181   * @param bool $icon Optional, default is false. Whether to include icon.
1182   * @param string|bool $text Optional, default is false. If string, then will be link text.
1183   * @return string HTML content.
1184   */
1185  function wp_get_attachment_link( $id = 0, $size = 'thumbnail', $permalink = false, $icon = false, $text = false ) {
1186      $id = intval( $id );
1187      $_post = get_post( $id );
1188  
1189      if ( empty( $_post ) || ( 'attachment' != $_post->post_type ) || ! $url = wp_get_attachment_url( $_post->ID ) )
1190          return __( 'Missing Attachment' );
1191  
1192      if ( $permalink )
1193          $url = get_attachment_link( $_post->ID );
1194  
1195      $post_title = esc_attr( $_post->post_title );
1196  
1197      if ( $text )
1198          $link_text = $text;
1199      elseif ( $size && 'none' != $size )
1200          $link_text = wp_get_attachment_image( $id, $size, $icon );
1201      else
1202          $link_text = '';
1203  
1204      if ( trim( $link_text ) == '' )
1205          $link_text = $_post->post_title;
1206  
1207      return apply_filters( 'wp_get_attachment_link', "<a href='$url'>$link_text</a>", $id, $size, $permalink, $icon, $text );
1208  }
1209  
1210  /**
1211   * Wrap attachment in <<p>> element before content.
1212   *
1213   * @since 2.0.0
1214   * @uses apply_filters() Calls 'prepend_attachment' hook on HTML content.
1215   *
1216   * @param string $content
1217   * @return string
1218   */
1219  function prepend_attachment($content) {
1220      $post = get_post();
1221  
1222      if ( empty($post->post_type) || $post->post_type != 'attachment' )
1223          return $content;
1224  
1225      $p = '<p class="attachment">';
1226      // show the medium sized image representation of the attachment if available, and link to the raw file
1227      $p .= wp_get_attachment_link(0, 'medium', false);
1228      $p .= '</p>';
1229      $p = apply_filters('prepend_attachment', $p);
1230  
1231      return "$p\n$content";
1232  }
1233  
1234  //
1235  // Misc
1236  //
1237  
1238  /**
1239   * Retrieve protected post password form content.
1240   *
1241   * @since 1.0.0
1242   * @uses apply_filters() Calls 'the_password_form' filter on output.
1243   * @param int|WP_Post $post Optional. A post id or post object. Defaults to the current post when in The Loop, undefined otherwise.
1244   * @return string HTML content for password form for password protected post.
1245   */
1246  function get_the_password_form( $post = 0 ) {
1247      $post = get_post( $post );
1248      $label = 'pwbox-' . ( empty($post->ID) ? rand() : $post->ID );
1249      $output = '<form action="' . esc_url( site_url( 'wp-login.php?action=postpass', 'login_post' ) ) . '" class="post-password-form" method="post">
1250      <p>' . __( 'This content is password protected. To view it please enter your password below:' ) . '</p>
1251      <p><label for="' . $label . '">' . __( 'Password:' ) . ' <input name="post_password" id="' . $label . '" type="password" size="20" /></label> <input type="submit" name="Submit" value="' . esc_attr__( 'Submit' ) . '" /></p>
1252      </form>
1253      ';
1254      return apply_filters( 'the_password_form', $output );
1255  }
1256  
1257  /**
1258   * Whether currently in a page template.
1259   *
1260   * This template tag allows you to determine if you are in a page template.
1261   * You can optionally provide a template name and then the check will be
1262   * specific to that template.
1263   *
1264   * @since 2.5.0
1265   * @uses $wp_query
1266   *
1267   * @param string $template The specific template name if specific matching is required.
1268   * @return bool True on success, false on failure.
1269   */
1270  function is_page_template( $template = '' ) {
1271      if ( ! is_page() )
1272          return false;
1273  
1274      $page_template = get_page_template_slug( get_queried_object_id() );
1275  
1276      if ( empty( $template ) )
1277          return (bool) $page_template;
1278  
1279      if ( $template == $page_template )
1280          return true;
1281  
1282      if ( 'default' == $template && ! $page_template )
1283          return true;
1284  
1285      return false;
1286  }
1287  
1288  /**
1289   * Get the specific template name for a page.
1290   *
1291   * @since 3.4.0
1292   *
1293   * @param int $post_id Optional. The page ID to check. Defaults to the current post, when used in the loop.
1294   * @return string|bool Page template filename. Returns an empty string when the default page template
1295   *     is in use. Returns false if the post is not a page.
1296   */
1297  function get_page_template_slug( $post_id = null ) {
1298      $post = get_post( $post_id );
1299      if ( ! $post || 'page' != $post->post_type )
1300          return false;
1301      $template = get_post_meta( $post->ID, '_wp_page_template', true );
1302      if ( ! $template || 'default' == $template )
1303          return '';
1304      return $template;
1305  }
1306  
1307  /**
1308   * Retrieve formatted date timestamp of a revision (linked to that revisions's page).
1309   *
1310   * @package WordPress
1311   * @subpackage Post_Revisions
1312   * @since 2.6.0
1313   *
1314   * @uses date_i18n()
1315   *
1316   * @param int|object $revision Revision ID or revision object.
1317   * @param bool $link Optional, default is true. Link to revisions's page?
1318   * @return string i18n formatted datetimestamp or localized 'Current Revision'.
1319   */
1320  function wp_post_revision_title( $revision, $link = true ) {
1321      if ( !$revision = get_post( $revision ) )
1322          return $revision;
1323  
1324      if ( !in_array( $revision->post_type, array( 'post', 'page', 'revision' ) ) )
1325          return false;
1326  
1327      /* translators: revision date format, see http://php.net/date */
1328      $datef = _x( 'j F, Y @ G:i', 'revision date format');
1329      /* translators: 1: date */
1330      $autosavef = _x( '%1$s [Autosave]', 'post revision title extra' );
1331      /* translators: 1: date */
1332      $currentf  = _x( '%1$s [Current Revision]', 'post revision title extra' );
1333  
1334      $date = date_i18n( $datef, strtotime( $revision->post_modified ) );
1335      if ( $link && current_user_can( 'edit_post', $revision->ID ) && $link = get_edit_post_link( $revision->ID ) )
1336          $date = "<a href='$link'>$date</a>";
1337  
1338      if ( !wp_is_post_revision( $revision ) )
1339          $date = sprintf( $currentf, $date );
1340      elseif ( wp_is_post_autosave( $revision ) )
1341          $date = sprintf( $autosavef, $date );
1342  
1343      return $date;
1344  }
1345  
1346  /**
1347   * Retrieve formatted date timestamp of a revision (linked to that revisions's page).
1348   *
1349   * @package WordPress
1350   * @subpackage Post_Revisions
1351   * @since 3.6.0
1352   *
1353   * @uses date_i18n()
1354   *
1355   * @param int|object $revision Revision ID or revision object.
1356   * @param bool $link Optional, default is true. Link to revisions's page?
1357   * @return string gravatar, user, i18n formatted datetimestamp or localized 'Current Revision'.
1358   */
1359  function wp_post_revision_title_expanded( $revision, $link = true ) {
1360      if ( !$revision = get_post( $revision ) )
1361          return $revision;
1362  
1363      if ( !in_array( $revision->post_type, array( 'post', 'page', 'revision' ) ) )
1364          return false;
1365  
1366      $author = get_the_author_meta( 'display_name', $revision->post_author );
1367      /* translators: revision date format, see http://php.net/date */
1368      $datef = _x( 'j F, Y @ G:i:s', 'revision date format');
1369  
1370      $gravatar = get_avatar( $revision->post_author, 24 );
1371  
1372      $date = date_i18n( $datef, strtotime( $revision->post_modified ) );
1373      if ( $link && current_user_can( 'edit_post', $revision->ID ) && $link = get_edit_post_link( $revision->ID ) )
1374          $date = "<a href='$link'>$date</a>";
1375  
1376      $revision_date_author = sprintf(
1377          /* translators: post revision title: 1: author avatar, 2: author name, 3: time ago, 4: date */
1378          _x( '%1$s %2$s, %3$s ago (%4$s)', 'post revision title' ),
1379          $gravatar,
1380          $author,
1381          human_time_diff( strtotime( $revision->post_modified ), current_time( 'timestamp' ) ),
1382          $date
1383      );
1384  
1385      $autosavef = __( '%1$s [Autosave]' );
1386      $currentf  = __( '%1$s [Current Revision]' );
1387  
1388      if ( !wp_is_post_revision( $revision ) )
1389          $revision_date_author = sprintf( $currentf, $revision_date_author );
1390      elseif ( wp_is_post_autosave( $revision ) )
1391          $revision_date_author = sprintf( $autosavef, $revision_date_author );
1392  
1393      return $revision_date_author;
1394  }
1395  
1396  /**
1397   * Display list of a post's revisions.
1398   *
1399   * Can output either a UL with edit links or a TABLE with diff interface, and
1400   * restore action links.
1401   *
1402   * @package WordPress
1403   * @subpackage Post_Revisions
1404   * @since 2.6.0
1405   *
1406   * @uses wp_get_post_revisions()
1407   * @uses wp_post_revision_title_expanded()
1408   * @uses get_edit_post_link()
1409   * @uses get_the_author_meta()
1410   *
1411   * @param int|object $post_id Post ID or post object.
1412   * @param string $type 'all' (default), 'revision' or 'autosave'
1413   * @return null
1414   */
1415  function wp_list_post_revisions( $post_id = 0, $type = 'all' ) {
1416      if ( ! $post = get_post( $post_id ) )
1417          return;
1418  
1419      // $args array with (parent, format, right, left, type) deprecated since 3.6
1420      if ( is_array( $type ) ) {
1421          $type = ! empty( $type['type'] ) ? $type['type']  : $type;
1422          _deprecated_argument( __FUNCTION__, '3.6' );
1423      }
1424  
1425      if ( ! $revisions = wp_get_post_revisions( $post->ID ) )
1426          return;
1427  
1428      $rows = '';
1429      foreach ( $revisions as $revision ) {
1430          if ( ! current_user_can( 'read_post', $revision->ID ) )
1431              continue;
1432  
1433          $is_autosave = wp_is_post_autosave( $revision );
1434          if ( ( 'revision' === $type && $is_autosave ) || ( 'autosave' === $type && ! $is_autosave ) )
1435              continue;
1436  
1437          $rows .= "\t<li>" . wp_post_revision_title_expanded( $revision ) . "</li>\n";
1438      }
1439  
1440      echo "<div class='hide-if-js'><p>" . __( 'JavaScript must be enabled to use this feature.' ) . "</p></div>\n";
1441  
1442      echo "<ul class='post-revisions hide-if-no-js'>\n";
1443      echo $rows;
1444      echo "</ul>";
1445  }


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