Determine access IP

判断访问IP

function getIP() {
	if (! empty ( $_SERVER ["HTTP_CLIENT_IP"] )) {
		$cip = $_SERVER ["HTTP_CLIENT_IP"];
	} else if (! empty ( $_SERVER ["HTTP_X_FORWARDED_FOR"] )) {
		$cip = $_SERVER ["HTTP_X_FORWARDED_FOR"];
	} else if (! empty ( $_SERVER ["REMOTE_ADDR"] )) {
		$cip = $_SERVER ["REMOTE_ADDR"];
	} else {
		$cip = '';
	}
	preg_match ( "/[d.]{7,15}/", $cip, $cips );
	$cip = isset ( $cips [0] ) ? $cips [0] : 'unknown';
	unset ( $cips );
	return $cip;
}

?>