每次点击链接后，转到的网址(网站)都不一定一样，是随机的！
<?php
$url[0] = "网址";
$url[1] = "网址";
$url[2] = "网址";
$url[3] = "网址";
$url[4] = "网址";
$url[5] = "http://www.phpxd.com/yuandaima/phpdmxxi.php";
srand ((double)microtime()*1000000);
$randomnum = rand(0, count($url)-1);
header ("Location: $url[$randomnum]");
?>
其实很挺简单的利用数组和header函数