public static function getAttachmentIdFromUrl($attachmentUrl = '')
    {
        if (empty($attachmentUrl)) {
            return;
        }
        global $wpdb;
        $attachmentId = false;
        // Get the upload directory paths
        $upload_dir_paths = wp_upload_dir();
        // Make sure the upload path base directory exists in the attachment URL,
        // to verify that we're working with a media library image
        if (false !== strpos($attachmentUrl, $upload_dir_paths['baseurl'])) {
            // If this is the URL of an auto-generated thumbnail, get the URL of the original image
            $attachmentUrl = preg_replace('/-\d+x\d+(?=\.(jpg|jpeg|png|gif)$)/i', '', $attachmentUrl);
            // Remove the upload path base directory from the attachment URL
            $attachmentUrl = str_replace($upload_dir_paths['baseurl'] . '/', '', $attachmentUrl);
            // Finally, run a custom database query to get the attachment ID from the modified
            // attachment URL
            $attachmentId = $wpdb->get_var(
                $wpdb->prepare(
                    "SELECT wposts.ID
					FROM {$wpdb->posts} wposts, {$wpdb->postmeta} wpostmeta
					WHERE wposts.ID = wpostmeta.post_id
					AND wpostmeta.meta_key = '_wp_attached_file'
					AND wpostmeta.meta_value = '%s'
					AND wposts.post_type = 'attachment'", $attachmentUrl));
        }
        return $attachmentId;
    }
public static function getAttachmentIdFromUrl($attachmentUrl = '')
    {
        if (empty($attachmentUrl)) {
            return;
        }
        global $wpdb;
        $attachmentId = false;
        // Get the upload directory paths
        $upload_dir_paths = wp_upload_dir();
        // Make sure the upload path base directory exists in the attachment URL,
        // to verify that we're working with a media library image
        if (false !== strpos($attachmentUrl, $upload_dir_paths['baseurl'])) {
            // If this is the URL of an auto-generated thumbnail, get the URL of the original image
            $attachmentUrl = preg_replace('/-\d+x\d+(?=\.(jpg|jpeg|png|gif)$)/i', '', $attachmentUrl);
            // Remove the upload path base directory from the attachment URL
            $attachmentUrl = str_replace($upload_dir_paths['baseurl'] . '/', '', $attachmentUrl);
            // Finally, run a custom database query to get the attachment ID from the modified
            // attachment URL
            $attachmentId = $wpdb->get_var(
                $wpdb->prepare(
                    "SELECT wposts.ID
					FROM {$wpdb->posts} wposts, {$wpdb->postmeta} wpostmeta
					WHERE wposts.ID = wpostmeta.post_id
					AND wpostmeta.meta_key = '_wp_attached_file'
					AND wpostmeta.meta_value = '%s'
					AND wposts.post_type = 'attachment'", $attachmentUrl));
        }
        return $attachmentId;
    }
public static function getAttachmentIdFromUrl ( $ attachmentUrl = '' ) { if ( empty ( $ attachmentUrl ) ) { return ; } global $ wpdb ; $ attachmentId = false ; // Get the upload directory paths $ upload_dir_paths = wp_upload_dir ( ) ; // Make sure the upload path base directory exists in the attachment URL, // to verify that we're working with a media library image if ( false !== strpos ( $ attachmentUrl , $ upload_dir_paths [ 'baseurl' ] ) ) { // If this is the URL of an auto-generated thumbnail, get the URL of the original image $ attachmentUrl = preg_replace ( '/-\d+x\d+(?=\.(jpg|jpeg|png|gif)$)/i' , '' , $ attachmentUrl ) ; // Remove the upload path base directory from the attachment URL $ attachmentUrl = str_replace ( $ upload_dir_paths [ 'baseurl' ] . '/' , '' , $ attachmentUrl ) ; // Finally, run a custom database query to get the attachment ID from the modified // attachment URL $ attachmentId = $ wpdb -> get_var ( $ wpdb -> prepare ( "SELECT wposts.ID
					FROM {$wpdb->posts} wposts, {$wpdb->postmeta} wpostmeta
					WHERE wposts.ID = wpostmeta.post_id
					AND wpostmeta.meta_key = '_wp_attached_file'
					AND wpostmeta.meta_value = '%s'
					AND wposts.post_type = 'attachment'" , $ attachmentUrl ) ) ; } return $ attachmentId ; }
Return the attachment ID from his url

@param string $attachmentUrl URL del attachment
@return integer ID del attachment
Return the attachment ID from his url