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   1  <?php
   2  /**
   3   * Twenty Thirteen back compat functionality
   4   *
   5   * Prevents Twenty Thirteen from running on WordPress versions prior to 3.6,
   6   * since this theme is not meant to be backward compatible and relies on
   7   * many new functions and markup changes introduced in 3.6.
   8   *
   9   * @package WordPress
  10   * @subpackage Twenty_Thirteen
  11   * @since Twenty Thirteen 1.0
  12   */
  13  
  14  /**
  15   * Prevent switching to Twenty Thirteen on old versions of WordPress.
  16   *
  17   * Switches to the default theme.
  18   *
  19   * @since Twenty Thirteen 1.0
  20   *
  21   * @return void
  22   */
  23  function twentythirteen_switch_theme() {
  24      switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );
  25      unset( $_GET['activated'] );
  26      add_action( 'admin_notices', 'twentythirteen_upgrade_notice' );
  27  }
  28  add_action( 'after_switch_theme', 'twentythirteen_switch_theme' );
  29  
  30  /**
  31   * Add message for unsuccessful theme switch.
  32   *
  33   * Prints an update nag after an unsuccessful attempt to switch to
  34   * Twenty Thirteen on WordPress versions prior to 3.6.
  35   *
  36   * @since Twenty Thirteen 1.0
  37   *
  38   * @return void
  39   */
  40  function twentythirteen_upgrade_notice() {
  41      $message = sprintf( __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] );
  42      printf( '<div class="error"><p>%s</p></div>', $message );
  43  }
  44  
  45  /**
  46   * Prevent the Theme Customizer from being loaded on WordPress versions prior to 3.6.
  47   *
  48   * @since Twenty Thirteen 1.0
  49   *
  50   * @return void
  51   */
  52  function twentythirteen_customize() {
  53      wp_die( sprintf( __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] ), '', array(
  54          'back_link' => true,
  55      ) );
  56  }
  57  add_action( 'load-customize.php', 'twentythirteen_customize' );
  58  
  59  /**
  60   * Prevent the Theme Preview from being loaded on WordPress versions prior to 3.4.
  61   *
  62   * @since Twenty Thirteen 1.0
  63   *
  64   * @return void
  65   */
  66  function twentythirteen_preview() {
  67      if ( isset( $_GET['preview'] ) ) {
  68          wp_die( sprintf( __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] ) );
  69      }
  70  }
  71  add_action( 'template_redirect', 'twentythirteen_preview' );