protected static function cache_get($contextlevel, $instance) {
        if (isset(self::$cache_contexts[$contextlevel][$instance])) {
            return self::$cache_contexts[$contextlevel][$instance];
        }
        return false;
    }
protected static function cache_get($contextlevel, $instance) {
        if (isset(self::$cache_contexts[$contextlevel][$instance])) {
            return self::$cache_contexts[$contextlevel][$instance];
        }
        return false;
    }
protected static function cache_get ( $ contextlevel , $ instance ) { if ( isset ( self :: $ cache_contexts [ $ contextlevel ] [ $ instance ] ) ) { return self :: $ cache_contexts [ $ contextlevel ] [ $ instance ] ; } return false ; }
Gets a context from the cache.

@static
@param int $contextlevel Context level
@param int $instance Instance ID
@return context|bool Context or false if not in cache
Gets a context from the cache .