PHP获取服务器IP和客户端IP

<?php

    echo '前端机IP：'.$_SERVER['REMOTE_ADDR'];
    echo '<br />';
    echo '后端机IP：'.$_SERVER['SERVER_ADDR'];
    echo '<br />';
    echo '客户机IP：'.$_SERVER['HTTP_X_FORWARDED_FOR'];
    echo '<br />';
    echo '代理端IP：'.$_SERVER['HTTP_CLIENT_IP'];
    echo '<br />';
    echo '代理IP：'.$_SERVER['HTTP_X_FORWARDER_FOR'];
    echo '<br />';

?>

二、

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2017/4/3
 * Time: 14:26
 */
function _getIp()
{
    if ($ip = getenv('HTTP_CLIENT_IP'))
        ;
    elseif ($ip = getenv('HTTP_X_FORWARDED_FOR'))
        ;
    elseif ($ip = getenv('HTTP_X_FORWARDED'))
        ;
    elseif ($ip = getenv('HTTP_FORWARDED_FOR'))
        ;
    elseif ($ip = getenv('HTTP_FORWARDED'))
        ;
    else
        $ip = $_SERVER['REMOTE_ADDR'];

    if (strpos($ip, ",") !== FALSE) {
        return substr($ip, 0, strpos($ip, ","));
    }
    return $ip;
}
// 判断网段
$ip = _getIp();
$net_seg = substr($ip, 0, strrpos($ip, '.'));
$legalIP = [];
if (isset($legalIP) && !in_array($net_seg, $legalIP) ) {
    echo '/error/no-access:'.$ip;
    exit();
}
echo "success:".$ip;