public function has($key) {
        $key = $this->formatKey($key);
        return array_has($this->headers, $key);
    }
public function has($key) {
        $key = $this->formatKey($key);
        return array_has($this->headers, $key);
    }
public function has ( $ key ) { $ key = $ this -> formatKey ( $ key ) ; return array_has ( $ this -> headers , $ key ) ; }
Check if there are any headers.

@param $key

@return bool
Check if there are any headers .