php 获取客户端IP地址2

<?php

/**
 * 获取客户端IP地址
 *
 * @return NULL | string
 */
function getClientIp()
{
    $ip = null;

    if ($ip !== null) {
        return $ip;
    }
    if (isset($_SERVER)) {
        if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
            foreach ($arr as $ip) {
                $ip = trim($ip);
                if ($ip != 'unknown') {
                    $ip = $ip;
                    break;
                }
            }
        } elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
            $ip = $_SERVER['HTTP_CLIENT_IP'];
        } elseif (isset($_SERVER['HTTP_CDN_SRC_IP'])) {
            $ip = $_SERVER['HTTP_CDN_SRC_IP'];
        } else {
            if (isset($_SERVER['REMOTE_ADDR'])) {
                $ip = $_SERVER['REMOTE_ADDR'];
            } else {
                $ip = '0.0.0.0';
            }
        }
    } else {
        if (getenv('HTTP_X_FORWARDED_FOR')) {
            $ip = getenv('HTTP_X_FORWARDED_FOR');
        } elseif (getenv('HTTP_CLIENT_IP')) {
            $ip = getenv('HTTP_CLIENT_IP');
        } elseif (getenv('HTTP_CDN_SRC_IP')) {
            $ip = getenv('HTTP_CDN_SRC_IP');
        } else {
            $ip = getenv('REMOTE_ADDR');
        }
    }
    $matches = [];
    preg_match("/[\d\.]{7,15}/", $ip, $matches);
    $ip = ! empty($matches[0]) ? $matches[0] : '0.0.0.0';

    return $ip;
}

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