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 ); 
}