php客户端ip的获取”get_client_ip() “

function get_client_ip() {
 $ip = $_SERVER['REMOTE_ADDR'];
 if (isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^([0-9]{1,3}\.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) {
 $ip = $_SERVER['HTTP_CLIENT_IP'];
 } elseif(isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND preg_match_all('#\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) {
 foreach ($matches[0] AS $xip) {
 if (!preg_match('#^(10|172\.16|192\.168)\.#', $xip)) {
 $ip = $xip;
 break;
 }
 }
 }
 return $ip;
 }
 $user_ip = get_client_ip();
 echo $user_ip;//输出ip