<?php 
header("Content-Type:text/html; charset=utf-8");
if(isset($_GET[‘id‘]))
    echo $_GET[‘id‘];
?>


<input  onclick="location.href=http://www.mamicode.com/‘?id=100‘"  type="button" value="http://www.mamicode.com/提交"/>

<a href="http://www.mamicode.com/?id"> 提交</a>