php代碼：
復制代碼 代碼如下:
<?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; //是否要邊框 1要:0不要
$how = $this->num; //驗證碼位數
$w = $this->width; //圖片寬度
$h = $this->height; //圖片高度
$fontsize = 5; //字體大小
$alpha = "abcdefghijkmnopqrstuvwxyz"; //驗證碼內容1:字母
$number = "023456789"; //驗證碼內容2:數字
$randcode = ""; //驗證碼字符串初始化
srand((double)microtime()*1000000); //初始化隨機數種子
$im = ImageCreate($w, $h); //創建驗證圖片
/*
* 繪制基本框架
*/
$bgcolor = ImageColorAllocate($im, 255, 255, 255); //設置背景顏色
ImageFill($im, 0, 0, $bgcolor); //填充背景色
if($border)
{
$black = ImageColorAllocate($im, 0, 0, 0); //設置邊框顏色
ImageRectangle($im, 0, 0, $w-1, $h-1, $black);//繪制邊框
}
/*
* 逐位產生隨機字符
*/
for($i=0; $i<$how; $i++)
{
$alpha_or_number = mt_rand(0, 1); //字母還是數字
$str = $alpha_or_number ? $alpha : $number;
$which = mt_rand(0, strlen($str)-1); //取哪個字符
$code = substr($str, $which, 1); //取字符
$j = !$i ? 4 : $j+15; //繪字符位置
$color3 = ImageColorAllocate($im, mt_rand(0,100), mt_rand(0,100), mt_rand(0,100)); //字符隨即顏色
ImageChar($im, $fontsize, $j, 3, $code, $color3); //繪字符
$randcode .= $code; //逐位加入驗證碼字符串
}
/*
* 添加干擾
*/
for($i=0; $i<5; $i++)//繪背景干擾線
{
$color1 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //干擾線顏色
ImageArc($im, mt_rand(-5,$w), mt_rand(-5,$h), mt_rand(20,300), mt_rand(20,200), 55, 44, $color1); //干擾線
}
for($i=0; $i<$how*15; $i++)//繪背景干擾點
{
$color2 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //干擾點顏色
ImageSetPixel($im, mt_rand(0,$w), mt_rand(0,$h), $color2); //干擾點
}
//把驗證碼字符串寫入session
//$this->session->set_userdata(array($this->name=>$randcode));
$_SESSION[$this->name]=$randcode;
/*繪圖結束*/
Imagegif($im);
ImageDestroy($im);
/*繪圖結束*/
}
}
?>
調用php代碼：
復制代碼 代碼如下:
function verify_image() {
$conf['name'] = 'verify_code'; //作為配置參數
$this->load->library('lib_captcha', $conf);
$this->lib_captcha->show();
$yzm_session = $this->session->userdata('verify_code');
echo $yzm_session;
}
html代碼：
復制代碼 代碼如下:
<dl>
<dt>驗證碼：</dt>
<dd>
<input type="text" name="verify_text" id="verify_text" class="yzma" value="">
<img src="/user/verify_image" alt="驗證碼" id="verify_code" class="yz_img" />
<a href="javascript:changeCode();" class="change_yz">換一張</a>
</dd>
<dd class="tips_wrong"><b>驗證碼不正確</b></dd>
<dd class="tips_correct"></dd>
</dl>
js代碼：
復制代碼 代碼如下:
<script type="text/javascript">
function changeCode(){
FS.query("#verify_code").src ="/user/verify_image?r=" + Math.random();
}
</script>
