PHP代理检测

isproxy.php

<?php
function isproxy(){
  $ports = array(80, 88, 1075, 1080, 1180, 1182, 2282, 3128, 3332, 5490, 6588, 7033, 7441, 8000, 8080, 8085, 8090, 8095, 8100, 8105, 8110, 8888, 22788);
	foreach ($ports as $port){
		$sd = @fsockopen($_SERVER["REMOTE_ADDR"], $port, $errno, $errstr, 1);
		if ($sd){
			fclose($sd);
			return true;
		}
	}
	return false;
}
//用法：
//if(isproxy())die('请勿使用代理申请！');