attachment_url_to_postid
Tries to convert an attachment URL into a post ID.
Description
(int) attachment_url_to_postid( (string) $url );
Returns (int)
The found post ID, or 0 on failure.
Parameters (1)
- 0. $url (string)
- The URL to resolve.
Usage
if ( !function_exists( 'attachment_url_to_postid' ) ) { require_once ABSPATH . WPINC . '/media.php'; } // The URL to resolve. $url = ''; // NOTICE! Understand what this does before running. $result = attachment_url_to_postid($url);
Defined (1)
The function is defined in the following location(s).
- /wp-includes/media.php
- function attachment_url_to_postid( $url ) {
- global $wpdb;
- $dir = wp_get_upload_dir();
- $path = $url;
- $site_url = parse_url( $dir['url'] );
- $image_path = parse_url( $path );
- //force the protocols to match if needed
- if ( isset( $image_path['scheme'] ) && ( $image_path['scheme'] !== $site_url['scheme'] ) ) {
- $path = str_replace( $image_path['scheme'], $site_url['scheme'], $path );
- }
- if ( 0 === strpos( $path, $dir['baseurl'] . '/' ) ) {
- $path = substr( $path, strlen( $dir['baseurl'] . '/' ) );
- }
- $sql = $wpdb->prepare(
- "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attached_file' AND meta_value = %s",
- $path
- );
- $post_id = $wpdb->get_var( $sql );
- /**
- * Filters an attachment id found by URL.
- *
- * @since 4.2.0
- *
- * @param int|null $post_id The post_id (if any) found by the function.
- * @param string $url The URL being looked up.
- */
- return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url );
- }