public function getUrlParam($key)
    {
        $pa = $this->getUrlParams();
        return isset($pa[$key]) ? $pa[$key] : null;
    }
public function getUrlParam($key)
    {
        $pa = $this->getUrlParams();
        return isset($pa[$key]) ? $pa[$key] : null;
    }
public function getUrlParam ( $ key ) { $ pa = $ this -> getUrlParams ( ) ; return isset ( $ pa [ $ key ] ) ? $ pa [ $ key ] : null ; }
Get url parameter by key
@param string $key parameter name
@return string the parameter value or null if non-exists.
Get url parameter by key