php代碼:
複製代碼 代碼如下:
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; //驗證碼位元
$w = $this->width; //圖片寬度
$h = $this->height; //圖片高度
$fontsize = 5; //字型大小
$alpha = "abcdefghijkmnopqrstuvwxyz"; //驗證碼內容1:字母
$number = "023456789"; //驗證碼內容2:數字
$randcode = ""; //驗證碼字串初始化
srand((double)microtime()*1000000); //初始化隨機數種子
$im = ImageCreate($w, $h); //建立驗證圖片
/*
* 繪製基本架構
*/
$bgcolor = ImageColorAllocate($im, 255, 255, 255); //設定背景顏色
ImageFill($im, 0, 0, $bgcolor); //填充背景色
if($border)
{
$black = ImageColorAllocate($im, 0, 0, 0); //設定邊框顏色
ImageRectangle($im, 0, 0, $w-1, $h-1, $black);//繪製邊框
}
/*
* 逐位產生隨機字元
*/
for($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); //取哪個字元
$code = substr($str, $which, 1); //取字元
$j = !$i ? 4 : $j+15; //繪字元位置
$color3 = ImageColorAllocate($im, mt_rand(0,100), mt_rand(0,100), mt_rand(0,100)); //字元隨即顏色
ImageChar($im, $fontsize, $j, 3, $code, $color3); //繪字元
$randcode .= $code; //逐位加入驗證碼字串
}
/*
* 添加幹擾
*/
for($i=0; $i<5; $i++)//繪背景幹擾線
{
$color1 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //幹擾線顏色
ImageArc($im, mt_rand(-5,$w), mt_rand(-5,$h), mt_rand(20,300), mt_rand(20,200), 55, 44, $color1); //幹擾線
}
for($i=0; $i<$how*15; $i++)//繪背景幹擾點
{
$color2 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //幹擾點顏色
ImageSetPixel($im, mt_rand(0,$w), mt_rand(0,$h), $color2); //幹擾點
}
//把驗證碼字串寫入session
//$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:
複製代碼 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:
複製代碼 代碼如下:
-
驗證碼:
-
換一張
-
驗證碼不正確
js代碼:
複製代碼 代碼如下:
http://www.bkjia.com/PHPjc/327905.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/327905.htmlTechArticlephp代碼: 複製代碼 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($...