public function purge( $limit = null )
    {
        $purgeCount = 0;
        return $this->purgeRecursive( $this->properties['location'], $limit, $purgeCount );
    }
public function purge( $limit = null )
    {
        $purgeCount = 0;
        return $this->purgeRecursive( $this->properties['location'], $limit, $purgeCount );
    }
public function purge ( $ limit = null ) { $ purgeCount = 0 ; return $ this -> purgeRecursive ( $ this -> properties [ 'location' ] , $ limit , $ purgeCount ) ; }
Purges the given number of cache items.

This method minimally purges the $limit number of outdated cache items
from the storage. If limit is left out, all outdated items are purged.
The purged item IDs are returned.

@param int $limit
@return array(string)
Purges the given number of cache items .