织梦 dedecms 5.7 中文验证码下载_dedecms教程_php教程

帮客户用织梦dedecms 5.7做了一个专业的商业网站，后来有机器注册垃圾会员，尝试了很多种办法防止无效后，就从网上找了个中文验证码，运行时不对，我作了修改了后可以运行，垃圾会员也明显的少了些，现在分享出来。

把文件vdimgck.php和simhei.ttf(字体文件)放在/下，vdimgck.php文件源码如下：

代码如下

<?php

/**

* 验证图片

* 在网上下的，经过阿亮修改

* 834114969@qq.com

* http://liuzhiliang.com/

require_once(dirname(__FILE__)."/common.inc.php");

//Session保存路径

$sessSavePath = DEDEDATA."/sessions/";

if(is_writeable($sessSavePath) && is_readable($sessSavePath)){ session_save_path($sessSavePath); }

if(!empty($cfg_domain_cookie)) session_set_cookie_params(0,'/',$cfg_domain_cookie);

session_start();

//获取随机字符

$rndstring = '';

//$ch_h = chr(($num,0,2)+160);

// $ch_l = chr(substr($num,2,2)+160);

function c2ch($num){

$ch_h = chr(substr($num,0,2)+160);

$ch_l = chr(substr($num,2,2)+160);

return $ch_h.$ch_l;

}

function num_rand(){

mt_srand((double)microtime() * 1000000);

$d= mt_rand(16,36);

$n= mt_rand(1,19);

return c2ch($d*100+$n);

}

for($i=0; $i<4; $i++) $rndstring .= gb2utf8(num_rand());

//如果支持GD，则绘图

if(function_exists("imagecreate"))

{

//Firefox部份情况会多次请求的问题，5秒内刷新页面将不改变session

$ntime = time();

if(empty($_SESSION['securimage_code_value_last']) || empty($_SESSION['securimage_code_value']) || ($ntime - $_SESSION['securimage_code_value_last'] > 1))

{

$_SESSION['securimage_code_value'] = strtolower($rndstring);

$_SESSION['securimage_code_value_last'] = $ntime;

}

$rndstring = $_SESSION['securimage_code_value'];

//创建图片，并设置背景色

$x_size=80;

$y_size=25;

$font='simhei.ttf';

$im=imagecreate($x_size,$y_size);

$background_color = imagecolorallocate ($im, 255, 255, 255);

// 随机颜色

$fontColor[] = imagecolorallocate($im, 0x15, 0x15, 0x15);

$fontColor[] = imagecolorallocate($im, 0x95, 0x1e, 0x04);

$fontColor[] = imagecolorallocate($im, 0x93, 0x14, 0xa9);

$fontColor[] = imagecolorallocate($im, 0x12, 0x81, 0x0a);

$fontColor[] = imagecolorallocate($im, 0x06, 0x3a, 0xd5);

$c_fontColor = $fontColor[mt_rand(0,4)];

imagettftext($im,15,mt_rand(-8,8),6,mt_rand(19,22),$c_fontColor,$font,substr($rndstring,0,3));

imagettftext($im,15,mt_rand(-8,8),37,20,$c_fontColor,$font,substr($rndstring,6,3));

imagettftext($im,mt_rand(15,17),mt_rand(-8,8),22,20,$c_fontColor,$font,substr($rndstring,3,3));

imagettftext($im,mt_rand(15,17),mt_rand(-8,8),54,mt_rand(19,22),$c_fontColor,$font,substr($rndstring,9,3));

imagerectangle($im, 0, 0, $x_size - 1, $y_size - 1,$black);

header("Pragma:no-cachern");

header("Cache-Control:no-cachern");

header("Expires:0rn");

//输出特定类型的图片格式，优先级为 gif -> jpg ->png

if(function_exists("imagejpeg"))

{

header("content-type:image/jpegrn");

imagejpeg($im);

}

else

{

header("content-type:image/pngrn");

imagepng($im);

}

ImageDestroy($im);

exit();

}

else

{

//不支持GD，只输出字母 ABCD

$_SESSION['securimage_code_value'] = "abcd";

$_SESSION['securimage_code_value_last'] = '';

header("content-type:image/jpegrn");

header("Pragma:no-cachern");

header("Cache-Control:no-cachern");

header("Expires:0rn");

$fp = ("data/vdcode.jpg","r");

echo fread($fp,filesize("data/vdcode.jpg"));

fclose($fp);

exit();

}

(责任编辑：最模板)