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钱可以买房子但买不到家,可以买婚姻但买不到爱情,可以买钟表但买不到时间,钱不是一切,反而是痛苦的根源。把你的钱给我,让我一个人承担痛苦吧 ##~~~年轻,就在自由的路上……爱情已欠费,缘分不在服务区~~~~~

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php怎么生成动态随机验证码

2009-09-07 17:01:45| 分类： PHP | 标签： |举报 |字号大中小订阅

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在php中如何生成随机验证码 php随机验证码程序，代码如下

文件a.php

<?
//checkNum.php
session_start();
function random($len)
{
$srcstr="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
mt_srand();
$strs="";
for($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
$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
$back=imagecolorallocate($im,0xFF,0xFF,0xFF);
//模糊点颜色
$pix=imagecolorallocate($im,187,230,247);
//字体色
$font=imagecolorallocate($im,41,163,238);
//绘模糊作用的点
mt_srand();
for($i=0;$i<1000;$i++)
{
imagesetpixel($im,mt_rand(0,$width),mt_rand(0,$height),$pix);
}
imagestring($im, 5, 7, 5,$str, $font);
imagerectangle($im,0,0,$width-1,$height-1,$font);
imagepng($im);
imagedestroy($im);
$_SESSION["code"] = $str;
?>

文件b.php

<?php
session_start();
echo "<img src=a.php border=0 align=absbottom>";//生成图片
echo $_SESSION["code"];//生成验证码值
?>

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<#-- 网易新闻广告 --> <#--右边模块结构--> <#--评论模块结构--> <#--引用模块结构--> <#--博主发起的投票-->

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