private function getNormalizedDirective($directive)
    {
        $directive = strtolower($directive);

        if (ctype_alpha($directive) === true) {
            $directive = "'" . $directive . "'";
        }

        return $directive;
    }
private function getNormalizedDirective($directive)
    {
        $directive = strtolower($directive);

        if (ctype_alpha($directive) === true) {
            $directive = "'" . $directive . "'";
        }

        return $directive;
    }
private function getNormalizedDirective ( $ directive ) { $ directive = strtolower ( $ directive ) ; if ( ctype_alpha ( $ directive ) === true ) { $ directive = "'" . $ directive . "'" ; } return $ directive ; }
Check if the given directive need to be converted.

@param string $directive
@return string
Check if the given directive need to be converted .