src/Debug/Config.php
private function debugKeyValues($key)
    {
        $values = array();
        // update 'collect and output'
        $requestKey = null;
        if (isset($_REQUEST['debug'])) {
            $requestKey = $_REQUEST['debug'];
        } elseif (isset($_COOKIE['debug'])) {
            $requestKey = $_COOKIE['debug'];
        }
        $isValidKey = $requestKey == $key;
        if ($isValidKey) {
            // only enable collect / don't disable it
            $values['collect'] = true;
        }
        $values['output'] = $isValidKey;
        return $values;
    }
private function debugKeyValues($key)
    {
        $values = array();
        // update 'collect and output'
        $requestKey = null;
        if (isset($_REQUEST['debug'])) {
            $requestKey = $_REQUEST['debug'];
        } elseif (isset($_COOKIE['debug'])) {
            $requestKey = $_COOKIE['debug'];
        }
        $isValidKey = $requestKey == $key;
        if ($isValidKey) {
            // only enable collect / don't disable it
            $values['collect'] = true;
        }
        $values['output'] = $isValidKey;
        return $values;
    }
Test $_REQUEST['debug'] against passed key
return collect & output values

@param string $key secret key

@return array