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<?php

//checkNum.php
ssion" title="session" >session_start();
function random($len)
{
$srcstr="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
mt_srand();//配置乱数种子
$strs="";
for($i=0;$i <$len;$i++){
$strs.=$srcstr[mt_rand(0,35)];
}

return strtoupper($strs);
}
$str=random(4); //随机生成的字符串" title="字符串" >字符串
$width = 50; //验证码图片的宽度
$height = 25; //验证码图片的高度

@header("Content-Type:image/png");
$_SESSION["code"] = $str;
//echo $str;
$im=imagecreate($width,$height);
//背景色

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