PEAR_Downloader::_testCycle PHP Метод

    function _testCycle($test, $deplinks, $dep)
    {
        static $visited = array();
        if ($test === null) {
            $visited = array();
            return;
        }
        // this happens when a parent has a dep cycle on another dependency
        // but the child is not part of the cycle
        if (isset($visited[$dep])) {
            return false;
        }
        $visited[$dep] = 1;
        if ($test == $dep) {
            return true;
        }
        if (isset($deplinks[$dep])) {
            if (in_array($test, array_keys($deplinks[$dep]), true)) {
                return true;
            }
            foreach ($deplinks[$dep] as $parent => $unused) {
                if ($this->_testCycle($test, $deplinks, $parent)) {
                    return true;
                }
            }
        }
        return false;
    }