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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 |
|---|---|
| 718 | * |
| 719 | * Allows for the addition and/or removal of potential enclosures to save |
| 720 | * to postmeta before checking the database for existing enclosures. |
| 721 | * |
| 722 | * @since 4.4.0 |
| 723 | * |
| 724 | * @param array $post_links An array of enclosure links. |
| 725 | * @param int $post_ID Post ID. |
| 726 | */ |
| 727 | $post_links = apply_filters( 'enclosure_links', $post_links, $post_ID ); |
| 728 | |
| 729 | foreach ( (array) $post_links as $url ) { |
| 730 | 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 ) . '%' ) ) ) { |
| 731 | |
| 732 | if ( $headers = wp_get_http_headers( $url ) ) { |
| 733 | $len = isset( $headers['content-length'] ) ? (int) $headers['content-length'] : 0; |
| 734 | $type = isset( $headers['content-type'] ) ? $headers['content-type'] : ''; |
| 735 | $allowed_types = array( 'video', 'audio' ); |
| 736 | |