private function checkUrl(&$url)
    {
        if ( ! is_string($url)) {
            throw new InvalidUrlException(
                'The url must be a string value, ' . gettype($url) . ' given'
            );
        }

        $url = trim($url);

        if (empty($url)) {
            throw new InvalidUrlException('The url must not be empty');
        }

        if (filter_var($url, FILTER_VALIDATE_URL) === false) {
            throw new InvalidUrlException('The url [' . $url . '] is invalid');
        }
    }
private function checkUrl(&$url)
    {
        if ( ! is_string($url)) {
            throw new InvalidUrlException(
                'The url must be a string value, ' . gettype($url) . ' given'
            );
        }

        $url = trim($url);

        if (empty($url)) {
            throw new InvalidUrlException('The url must not be empty');
        }

        if (filter_var($url, FILTER_VALIDATE_URL) === false) {
            throw new InvalidUrlException('The url [' . $url . '] is invalid');
        }
    }
private function checkUrl ( & $ url ) { if ( ! is_string ( $ url ) ) { throw new InvalidUrlException ( 'The url must be a string value, ' . gettype ( $ url ) . ' given' ) ; } $ url = trim ( $ url ) ; if ( empty ( $ url ) ) { throw new InvalidUrlException ( 'The url must not be empty' ) ; } if ( filter_var ( $ url , FILTER_VALIDATE_URL ) === false ) { throw new InvalidUrlException ( 'The url [' . $ url . '] is invalid' ) ; } }
Check URL.

@param  string  $url

@throws \Arcanedev\NoCaptcha\Exceptions\InvalidUrlException
Check URL .