005-PHP gets the visitor's real IP

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/**
* 获取来访者的真实IP
*
*/

function getRealIp() {
	static $realip = null;
	if($realip !== null) {
		return $realip;
	}

	if(getenv('REMOTE_ADDR')) {
		$realip = getenv('REMOTE_ADDR');
	} else if(getenv('HTTP_CLIENT_IP')) {
		$realip = getenv('HTTP_CLIENT_IP');
	} else if (getenv('HTTP_X_FROWARD_FOR')) {
		$realip = getenv('HTTP_X_FROWARD_FOR');
	}

	return $realip;	
}

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