php 安全过滤后获取IP地址

function getIP() {
    $realip = ''; //设置默认值
    if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        $realip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    } elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
        $realip = $_SERVER['HTTP_CLIENT_IP'];
    } else {
        $realip = $_SERVER['REMOTE_ADDR'];
    }
    preg_match('/^((?:\d{1,3}\.){3}\d{1,3})/',$realip,$match);
    return $match?$match[0]:false;
}

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