php验证码

来源：互联网发布：c语言的数据类型定义编辑：程序博客网时间：2024/06/06 04:34

<html><title>用户注册</title><head><meta http-equiv="Content-Type" content="text/html;charset=utf-8"><script language="javascript">function check(){if(myform.username.value == ""){alert("用户名不能为空！");myform.username.focus();return false;}if(myform.pwd.value == ""){alert("密码不能为空！");myform.pwd.focus();return false;}if(myform.ccode.value == ""){alert("验证码不能为空！");myform.ccode.focus();return false;}return true;}</script></head><body><form action="" method="post" onsubmit="javascript:return check()" name="myform"><label for="user">姓    名：</label><input type="text" name="username" id="user"/><br><label for="pwd">密    码：</label><input type="password" name="pwd" id="pwd"/><br><label for="ccode">验证码：</label><input type="text" name="ccode" id="ccode"><?php $num=mt_rand(1000,9999);for($i=0;$i<4;$i++){$n=substr($num,$i,1);echo "<image src='images/code/$n.gif'>";}?><br>                <input type="submit" name="sub" value="提交"/></form></body></html>

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