private function validateOptions(array $options) {
        foreach ($options as $key => $value) {
            if (!is_int($key)) return $this->invalidArgumentException('Error while setting a curl option (http://php.net/manual/de/function.curl-setopt.php). Tried to set ' . $key . ' on curl resource.');
        }
        return $this;
    }
private function validateOptions(array $options) {
        foreach ($options as $key => $value) {
            if (!is_int($key)) return $this->invalidArgumentException('Error while setting a curl option (http://php.net/manual/de/function.curl-setopt.php). Tried to set ' . $key . ' on curl resource.');
        }
        return $this;
    }
private function validateOptions ( array $ options ) { foreach ( $ options as $ key => $ value ) { if ( ! is_int ( $ key ) ) return $ this -> invalidArgumentException ( 'Error while setting a curl option (http://php.net/manual/de/function.curl-setopt.php). Tried to set ' . $ key . ' on curl resource.' ) ; } return $ this ; }
validates the given options

@param  array $options
@return $this
validates the given options