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   1  <?php
   2  /**
   3   * Twenty Sixteen back compat functionality
   4   *
   5   * Prevents Twenty Sixteen from running on WordPress versions prior to 4.4,
   6   * since this theme is not meant to be backward compatible beyond that and
   7   * relies on many newer functions and markup changes introduced in 4.4.
   8   *
   9   * @package WordPress
  10   * @subpackage Twenty_Sixteen
  11   * @since Twenty Sixteen 1.0
  12   */
  13  
  14  /**
  15   * Prevent switching to Twenty Sixteen on old versions of WordPress.
  16   *
  17   * Switches to the default theme.
  18   *
  19   * @since Twenty Sixteen 1.0
  20   */
  21  function twentysixteen_switch_theme() {
  22      switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );
  23  
  24      unset( $_GET['activated'] );
  25  
  26      add_action( 'admin_notices', 'twentysixteen_upgrade_notice' );
  27  }
  28  add_action( 'after_switch_theme', 'twentysixteen_switch_theme' );
  29  
  30  /**
  31   * Adds a message for unsuccessful theme switch.
  32   *
  33   * Prints an update nag after an unsuccessful attempt to switch to
  34   * Twenty Sixteen on WordPress versions prior to 4.4.
  35   *
  36   * @since Twenty Sixteen 1.0
  37   *
  38   * @global string $wp_version WordPress version.
  39   */
  40  function twentysixteen_upgrade_notice() {
  41      /* translators: %s: The current WordPress version. */
  42      $message = sprintf( __( 'Twenty Sixteen requires at least WordPress version 4.4. You are running version %s. Please upgrade and try again.', 'twentysixteen' ), $GLOBALS['wp_version'] );
  43      printf( '<div class="error"><p>%s</p></div>', $message );
  44  }
  45  
  46  /**
  47   * Prevents the Customizer from being loaded on WordPress versions prior to 4.4.
  48   *
  49   * @since Twenty Sixteen 1.0
  50   *
  51   * @global string $wp_version WordPress version.
  52   */
  53  function twentysixteen_customize() {
  54      wp_die(
  55          /* translators: %s: The current WordPress version. */
  56          sprintf( __( 'Twenty Sixteen requires at least WordPress version 4.4. You are running version %s. Please upgrade and try again.', 'twentysixteen' ), $GLOBALS['wp_version'] ),
  57          '',
  58          array(
  59              'back_link' => true,
  60          )
  61      );
  62  }
  63  add_action( 'load-customize.php', 'twentysixteen_customize' );
  64  
  65  /**
  66   * Prevents the Theme Preview from being loaded on WordPress versions prior to 4.4.
  67   *
  68   * @since Twenty Sixteen 1.0
  69   *
  70   * @global string $wp_version WordPress version.
  71   */
  72  function twentysixteen_preview() {
  73      if ( isset( $_GET['preview'] ) ) {
  74          /* translators: %s: The current WordPress version. */
  75          wp_die( sprintf( __( 'Twenty Sixteen requires at least WordPress version 4.4. You are running version %s. Please upgrade and try again.', 'twentysixteen' ), $GLOBALS['wp_version'] ) );
  76      }
  77  }
  78  add_action( 'template_redirect', 'twentysixteen_preview' );