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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 |
|---|---|
| 888 | * |
| 889 | * Allows for the addition and/or removal of potential enclosures to save |
| 890 | * to postmeta before checking the database for existing enclosures. |
| 891 | * |
| 892 | * @since 4.4.0 |
| 893 | * |
| 894 | * @param string[] $post_links An array of enclosure links. |
| 895 | * @param int $post_ID Post ID. |
| 896 | */ |
| 897 | $post_links = apply_filters( 'enclosure_links', $post_links, $post->ID ); |
| 898 | |
| 899 | foreach ( (array) $post_links as $url ) { |
| 900 | 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 ) . '%' ) ) ) { |
| 901 | |
| 902 | $headers = wp_get_http_headers( $url ); |
| 903 | if ( $headers ) { |
| 904 | $len = isset( $headers['content-length'] ) ? (int) $headers['content-length'] : 0; |
| 905 | $type = isset( $headers['content-type'] ) ? $headers['content-type'] : ''; |
| 906 | $allowed_types = array( 'video', 'audio' ); |