url.php
protected function chompScheme(&$url)
    {
        if (preg_match('#^([^/:]*):(//)(.*)#', $url, $matches)) {
            $url = $matches[2] . $matches[3];

            return $matches[1];
        }

        return false;
    }
protected function chompScheme(&$url)
    {
        if (preg_match('#^([^/:]*):(//)(.*)#', $url, $matches)) {
            $url = $matches[2] . $matches[3];

            return $matches[1];
        }

        return false;
    }
Extracts the scheme part of an incoming URL.

@param string $url   URL so far. The scheme will be removed.

@return string       Scheme part or false.