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   1  <?php
   2  /**
   3   * Loads the correct template based on the visitor's URL
   4   *
   5   * @package WordPress
   6   */
   7  if ( wp_using_themes() ) {
   8      /**
   9       * Fires before determining which template to load.
  10       *
  11       * This action hook executes just before WordPress determines which template page to load.
  12       * It is a good hook to use if you need to do a redirect with full knowledge of the content
  13       * that has been queried.
  14       *
  15       * Note: Loading a different template is not a good use of this hook. If you include another template
  16       * and then use `exit()` or `die()`, no subsequent `template_redirect` hooks will be run, which could
  17       * break the site’s functionality. Instead, use the {@see 'template_include'} filter hook to return
  18       * the path to the new template you want to use. This will allow an alternative template to be used
  19       * without interfering with the WordPress loading process.
  20       *
  21       * @since 1.5.0
  22       */
  23      do_action( 'template_redirect' );
  24  }
  25  
  26  /**
  27   * Filters whether to allow 'HEAD' requests to generate content.
  28   *
  29   * Provides a significant performance bump by exiting before the page
  30   * content loads for 'HEAD' requests. See #14348.
  31   *
  32   * @since 3.5.0
  33   *
  34   * @param bool $exit Whether to exit without generating any content for 'HEAD' requests. Default true.
  35   */
  36  if ( 'HEAD' === $_SERVER['REQUEST_METHOD'] && apply_filters( 'exit_on_http_head', true ) ) {
  37      exit;
  38  }
  39  
  40  // Process feeds and trackbacks even if not using themes.
  41  if ( is_robots() ) {
  42      /**
  43       * Fired when the template loader determines a robots.txt request.
  44       *
  45       * @since 2.1.0
  46       */
  47      do_action( 'do_robots' );
  48      return;
  49  } elseif ( is_favicon() ) {
  50      /**
  51       * Fired when the template loader determines a favicon.ico request.
  52       *
  53       * @since 5.4.0
  54       */
  55      do_action( 'do_favicon' );
  56      return;
  57  } elseif ( is_feed() ) {
  58      do_feed();
  59      return;
  60  } elseif ( is_trackback() ) {
  61      require  ABSPATH . 'wp-trackback.php';
  62      return;
  63  }
  64  
  65  if ( wp_using_themes() ) {
  66  
  67      $tag_templates = array(
  68          'is_embed'             => 'get_embed_template',
  69          'is_404'               => 'get_404_template',
  70          'is_search'            => 'get_search_template',
  71          'is_front_page'        => 'get_front_page_template',
  72          'is_home'              => 'get_home_template',
  73          'is_privacy_policy'    => 'get_privacy_policy_template',
  74          'is_post_type_archive' => 'get_post_type_archive_template',
  75          'is_tax'               => 'get_taxonomy_template',
  76          'is_attachment'        => 'get_attachment_template',
  77          'is_single'            => 'get_single_template',
  78          'is_page'              => 'get_page_template',
  79          'is_singular'          => 'get_singular_template',
  80          'is_category'          => 'get_category_template',
  81          'is_tag'               => 'get_tag_template',
  82          'is_author'            => 'get_author_template',
  83          'is_date'              => 'get_date_template',
  84          'is_archive'           => 'get_archive_template',
  85      );
  86      $template      = false;
  87  
  88      // Loop through each of the template conditionals, and find the appropriate template file.
  89      foreach ( $tag_templates as $tag => $template_getter ) {
  90          if ( call_user_func( $tag ) ) {
  91              $template = call_user_func( $template_getter );
  92          }
  93  
  94          if ( $template ) {
  95              if ( 'is_attachment' === $tag ) {
  96                  remove_filter( 'the_content', 'prepend_attachment' );
  97              }
  98  
  99              break;
 100          }
 101      }
 102  
 103      if ( ! $template ) {
 104          $template = get_index_template();
 105      }
 106  
 107      /**
 108       * Filters the path of the current template before including it.
 109       *
 110       * @since 3.0.0
 111       *
 112       * @param string $template The path of the template to include.
 113       */
 114      $template = apply_filters( 'template_include', $template );
 115      if ( $template ) {
 116          include $template;
 117      } elseif ( current_user_can( 'switch_themes' ) ) {
 118          $theme = wp_get_theme();
 119          if ( $theme->errors() ) {
 120              wp_die( $theme->errors() );
 121          }
 122      }
 123      return;
 124  }