WordPress函数wp_delete_attachment()代码实现通过id进行删除附件
用法:
<?php wp_delete_attachment( $attachmentid, $force_delete ); ?>
参数:
$attachmentid
(integer) (必填) 要删除的附件ID
默认值:None
$force_delete
(bool) (可选) 是否绕过回收站并强制删除
默认值: false
源文件:
/** * Trash or delete an attachment. * * When an attachment is permanently deleted, the file will also be removed. * Deletion removes all post meta fields, taxonomy, comments, etc. associated * with the attachment (except the main post). * * The attachment is moved to the trash instead of permanently deleted unless trash * for media is disabled, item is already in the trash, or $force_delete is true. * * @since 2.0.0 * * @global wpdb $wpdb WordPress database abstraction object. * * @param int $post_id Attachment ID. * @param bool $force_delete Optional. Whether to bypass trash and force deletion. * Default false. * @return mixed False on failure. Post data on success. */ function wp_delete_attachment( $post_id, $force_delete = false ) { global $wpdb; if ( !$post = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id) ) ) return $post; if ( 'attachment' != $post->post_type ) return false; if ( !$force_delete && EMPTY_TRASH_DAYS && MEDIA_TRASH && 'trash' != $post->post_status ) return wp_trash_post( $post_id ); delete_post_meta($post_id, '_wp_trash_meta_status'); delete_post_meta($post_id, '_wp_trash_meta_time'); $meta = wp_get_attachment_metadata( $post_id ); $backup_sizes = get_post_meta( $post->ID, '_wp_attachment_backup_sizes', true ); $file = get_attached_file( $post_id ); if ( is_multisite() ) delete_transient( 'dirsize_cache' ); /** * Fires before an attachment is deleted, at the start of wp_delete_attachment(). * * @since 2.0.0 * * @param int $post_id Attachment ID. */ do_action( 'delete_attachment', $post_id ); wp_delete_object_term_relationships($post_id, array('category', 'post_tag')); wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type)); // Delete all for any posts. delete_metadata( 'post', null, '_thumbnail_id', $post_id, true ); $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id )); foreach ( $comment_ids as $comment_id ) wp_delete_comment( $comment_id, true ); $post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $post_id )); foreach ( $post_meta_ids as $mid ) delete_metadata_by_mid( 'post', $mid ); /** This action is documented in wp-includes/post.php */ do_action( 'delete_post', $post_id ); $result = $wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) ); if ( ! $result ) { return false; } /** This action is documented in wp-includes/post.php */ do_action( 'deleted_post', $post_id ); $uploadpath = wp_upload_dir(); if ( ! empty($meta['thumb']) ) { // Don't delete the thumb if another attachment uses it. if (! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%' . $wpdb->esc_like( $meta['thumb'] ) . '%', $post_id)) ) { $thumbfile = str_replace(basename($file), $meta['thumb'], $file); /** This filter is documented in wp-includes/functions.php */ $thumbfile = apply_filters( 'wp_delete_file', $thumbfile ); @ unlink( path_join($uploadpath['basedir'], $thumbfile) ); } } // Remove intermediate and backup images if there are any. if ( isset( $meta['sizes'] ) && is_array( $meta['sizes'] ) ) { foreach ( $meta['sizes'] as $size => $sizeinfo ) { $intermediate_file = str_replace( basename( $file ), $sizeinfo['file'], $file ); /** This filter is documented in wp-includes/functions.php */ $intermediate_file = apply_filters( 'wp_delete_file', $intermediate_file ); @ unlink( path_join( $uploadpath['basedir'], $intermediate_file ) ); } } if ( is_array($backup_sizes) ) { foreach ( $backup_sizes as $size ) { $del_file = path_join( dirname($meta['file']), $size['file'] ); /** This filter is documented in wp-includes/functions.php */ $del_file = apply_filters( 'wp_delete_file', $del_file ); @ unlink( path_join($uploadpath['basedir'], $del_file) ); } } wp_delete_file( $file ); clean_post_cache( $post ); return $post; }