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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 908 |       * | 
| 909 |       * Allows for the addition and/or removal of potential enclosures to save | 
| 910 |       * to postmeta before checking the database for existing enclosures. | 
| 911 |       * | 
| 912 |       * @since 4.4.0 | 
| 913 |       * | 
| 914 |       * @param string[] $post_links An array of enclosure links. | 
| 915 |       * @param int      $post_ID    Post ID. | 
| 916 |       */ | 
| 917 |      $post_links = apply_filters( 'enclosure_links', $post_links, $post->ID ); | 
| 918 |  | 
| 919 |      foreach ( (array) $post_links as $url ) { | 
| 920 |           $url = strip_fragment_from_url( $url ); | 
| 921 |  | 
| 922 |           if ( '' !== $url && ! $wpdb->get_var( $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = 'enclosure' AND meta_value LIKE %s", $post->ID, $wpdb->esc_like( $url ) . '%' ) ) ) { | 
| 923 |  | 
| 924 |                $headers = wp_get_http_headers( $url ); | 
| 925 |                if ( $headers ) { | 
| 926 |                     $len           = isset( $headers['content-length'] ) ? (int) $headers['content-length'] : 0; |