易截截图软件、单文件、免安装、纯绿色、仅160KB

完整的PHP图形验证码程序源码!


代码如下:
<?php
   /*   网站验证码程序
    *   运行环境: PHP5.0.18 下调试通过
    *   需要 gd2 图形库支持(PHP.INI中 php_gd2.dll开启)
    *   文件名: showimg.php
    *   作者:  17php.com
    *   Date:   2007.03
    *   技术支持: www.17php.com
    */
   //随机生成一个4位数的数字验证码
    $num="";
    for($i=0;$i<4;$i++){
    $num .= rand(0,9);
    }
   //4位验证码也可以用rand(1000,9999)直接生成
   //将生成的验证码写入session,备验证页面使用
    Session_start();
    $_SESSION["Checknum"] = $num;
   //创建图片,定义颜色值
    Header("Content-type: image/PNG");
    srand((double)microtime()*1000000);
    $im = imagecreate(60,20);
    $black = ImageColorAllocate($im, 0,0,0);
    $gray = ImageColorAllocate($im, 200,200,200);
    imagefill($im,0,0,$gray);
    //随机绘制两条虚线,起干扰作用
    $style = array($black, $black, $black, $black, $black, $gray, $gray, $gray, $gray, $gray);
    imagesetstyle($im, $style);
    $y1=rand(0,20);
    $y2=rand(0,20);
    $y3=rand(0,20);
    $y4=rand(0,20);
    imageline($im,


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