php 捕获访客的实际IP地址

Posted 2021-05-05

	/**
	 * Gets visitor actual IP address.
	 */
	function getRealIPAddr()
	{
		$ipaddress = '';
		if (isset($_SERVER['HTTP_CLIENT_IP'])) {
			$ipaddress = $_SERVER['HTTP_CLIENT_IP'];
		} elseif (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
			$ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
		} elseif (isset($_SERVER['HTTP_X_FORWARDED'])) {
			$ipaddress = $_SERVER['HTTP_X_FORWARDED'];
		} elseif (isset($_SERVER['HTTP_FORWARDED_FOR'])) {
			$ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
		} elseif (isset($_SERVER['HTTP_FORWARDED'])) {
			$ipaddress = $_SERVER['HTTP_FORWARDED'];
		} elseif (isset($_SERVER['REMOTE_ADDR'])) {
			$ipaddress = $_SERVER['REMOTE_ADDR'];
		} else {
			$ipaddress = 'UNKNOWN';
		}
		return $ipaddress;
	}