public function rateLimit($key = null) {
		return $key ? (isset($this->rate_limit[$key]) ? $this->rate_limit[$key] : null) : $this->rate_limit;
	}
public function rateLimit($key = null) {
		return $key ? (isset($this->rate_limit[$key]) ? $this->rate_limit[$key] : null) : $this->rate_limit;
	}
public function rateLimit ( $ key = null ) { return $ key ? ( isset ( $ this -> rate_limit [ $ key ] ) ? $ this -> rate_limit [ $ key ] : null ) : $ this -> rate_limit ; }
Return the response's rate limit info array, a key from the array, or null if the info or key does not exist.

@param string $key (optional)
@return mixed
Return the response s rate limit info array a key from the array or null if the info or key does not exist .