
WordPress数据库初学者指南
do_enclose ( $content, $post )
do_enclose: 这个钩子用来为一个文章打印一个封套。
检查内容中的视频和音频链接,以添加为附件。
不会添加已经添加过的附件,并且会删除已经不在文章中的附件。这就是所谓的pingbacks和trackbacks。
function do_enclose( $content, $post ) { global $wpdb; // @todo Tidy this code and make the debug code optional. include_once ABSPATH . WPINC . '/class-IXR.php'; $post = get_post( $post ); if ( ! $post ) { return false; } if ( null === $content ) { $content = $post->post_content; } $post_links = array(); $pung = get_enclosed( $post->ID ); $post_links_temp = wp_extract_urls( $content ); foreach ( $pung as $link_test ) { // Link is no longer in post. if ( ! in_array( $link_test, $post_links_temp, true ) ) { $mids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = 'enclosure' AND meta_value LIKE %s", $post->ID, $wpdb->esc_like( $link_test ) . '%' ) ); foreach ( $mids as $mid ) { delete_metadata_by_mid( 'post', $mid ); } } } foreach ( (array) $post_links_temp as $link_test ) { // If we haven't pung it already. if ( ! in_array( $link_test, $pung, true ) ) { $test = parse_url( $link_test ); if ( false === $test ) { continue; } if ( isset( $test['query'] ) ) { $post_links[] = $link_test; } elseif ( isset( $test['path'] ) && ( '/' !== $test['path'] ) && ( '' !== $test['path'] ) ) { $post_links[] = $link_test; } } } /** * Filters the list of enclosure links before querying the database. * * Allows for the addition and/or removal of potential enclosures to save * to postmeta before checking the database for existing enclosures. * * @since 4.4.0 * * @param string[] $post_links An array of enclosure links. * @param int $post_ID Post ID. */ $post_links = apply_filters( 'enclosure_links', $post_links, $post->ID ); foreach ( (array) $post_links as $url ) { $url = strip_fragment_from_url( $url ); 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 ) . '%' ) ) ) { $headers = wp_get_http_headers( $url ); if ( $headers ) { $len = isset( $headers['content-length'] ) ? (int) $headers['content-length'] : 0; $type = isset( $headers['content-type'] ) ? $headers['content-type'] : ''; $allowed_types = array( 'video', 'audio' ); // Check to see if we can figure out the mime type from the extension. $url_parts = parse_url( $url ); if ( false !== $url_parts && ! empty( $url_parts['path'] ) ) { $extension = pathinfo( $url_parts['path'], PATHINFO_EXTENSION ); if ( ! empty( $extension ) ) { foreach ( wp_get_mime_types() as $exts => $mime ) { if ( preg_match( '!^(' . $exts . ')$!i', $extension ) ) { $type = $mime; break; } } } } if ( in_array( substr( $type, 0, strpos( $type, '/' ) ), $allowed_types, true ) ) { add_post_meta( $post->ID, 'enclosure', "$urln$lenn$mimen" ); } } } } }