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本帖最后由 125424334 于 2011-11-4 16:27 编辑
PHP复制代码
验证码类
<?php
class Captcha_code
{
var $width='60';
var $num='4';
var $height='20';
var $name='randcode';
public function __construct ($conf="")
{
if($conf!="")
{
foreach($conf as $key=>$value)
{
$this->$key=$value;
}
}
}
function show ()
{
Header("Content-type: image/gif");
/*
* 初始化
*/
$border = 0; //是否要边框 1要:0不要
$how = $this->num; //验证码位数
$w = $this->width; //图片宽度
$h = $this->height; //图片高度
$fontsize = 5; //字体大小
$alpha = "abcdefghijkmnopqrstuvwxyz"; //验证码内容1:字母
$number = "023456789"; //验证码内容2:数字
$randcode = ""; //验证码字符串初始化
srand((double )microtime()*1000000); //初始化随机数种子
$im = ImageCreate($w, $h); //创建验证图片
/*
* 绘制基本框架
*/
$bgcolor = ImageColorAllocate($im, 255, 255, 255); //设置背景颜色
ImageFill($im, 0, 0, $bgcolor); //填充背景色
if($border)
{
$black = ImageColorAllocate($im, 0, 0, 0); //设置边框颜色
ImageRectangle($im, 0, 0, $w-1, $h-1, $black);//绘制边框
}
/*
* 逐位产生随机字符
*/
for($i=0; $i<$how; $i++)
{
$alpha_or_number = mt_rand(0, 1); //字母还是数字
$str = $alpha_or_number ? $alpha : $number;
$which = mt_rand(0, strlen($str)-1); //取哪个字符
$code = substr($str, $which, 1); //取字符
$j = !$i ? 4 : $j+15; //绘字符位置
$color3 = ImageColorAllocate($im, mt_rand(0,100), mt_rand(0,100), mt_rand(0,100)); //字符随即颜色
ImageChar($im, $fontsize, $j, 3, $code, $color3); //绘字符
$randcode .= $code; //逐位加入验证码字符串
}
/*
* 添加干扰
*/
for($i=0; $i<5; $i++)//绘背景干扰线
{
$color1 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //干扰线颜色
ImageArc($im, mt_rand(-5,$w), mt_rand(-5,$h), mt_rand(20,300), mt_rand(20,200), 55, 44, $color1); //干扰线
}
for($i=0; $i<$how*15; $i++)//绘背景干扰点
{
$color2 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //干扰点颜色
ImageSetPixel($im, mt_rand(0,$w), mt_rand(0,$h), $color2); //干扰点
}
//把验证码字符串写入session
//$this->session->set_userdata($this->name,$randcode));
$CI = & get_instance ();
$CI->session->set_userdata($this->name, $randcode);
/*绘图结束*/
Imagegif($im);
ImageDestroy($im);
/*绘图结束*/
}
}
?>
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PHP复制代码
控制器
<?php
class Welcome extends CI_Controller {
function _construct ()
{
parent ::Controller();
}
/*
*跳转到登陆页
*/
function Index ()
{
$this->load->helper('url');
//$this->load->view('User/Login');
$this->load->view('User/Test');
}
function yzm ()
{
$conf['name']='yzm';
$this->load->library('captcha_code',$conf);
$this->captcha_code->show();
}
function check ()
{
$aaa=$this->session->userdata('yzm');
print_r($aaa);
$this->load->helper('url');
$this->load->view('User/Test');
}
}
?>
复制代码PHP复制代码
页面
<img src="<?php echo site_url('Welcome/yzm');?>" name="checkCodeImg" id="checkCodeImg" border="0" />
<a href="http://localhost/index.php/Welcome/check">aaa</a>
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PHP复制代码
$autoload['libraries'] = array('session');
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check()方法中的session值是空值!调了好久都不知道哪里出错 各位大神求救
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