ezsystems / ezpublish-kernel

        // Usage of X-Group-Location-Id is deprecated.

        if ($request->headers->has('X-Group-Location-Id')) {

            $aLocationId = explode('; ', $request->headers->get('X-Group-Location-Id'));

        } elseif ($locationId[0] === '(' && substr($locationId, -1) === ')') {

            // Equivalent to X-Group-Location-Id, using a simple Regexp:

            // (123|456|789) => Purge for #123, #456 and #789 location IDs.

            $aLocationId = explode('|', substr($locationId, 1, -1));

        } else {

            $aLocationId = array($locationId);

        }

        if ($request->headers->has('xkey')) {

            $tags = explode(' ', $request->headers->get('xkey'));

        } elseif ($locationId[0] === '(' && substr($locationId, -1) === ')') {

            // Deprecated: (123|456|789) => Purge for #123, #456 and #789 location IDs.

            $tags = array_map(

                function ($id) {return 'location-' . $id;},

                explode('|', substr($locationId, 1, -1))

            );

        } else {

            $tags = array('location-' . $locationId);

        }