<?php
??
? ?check_code();
? ?
? //隨機(jī)產(chǎn)生驗(yàn)證碼的字元或數(shù)字
? ?function check_code($width=100, $height=50,$num=4, $type='jpeg')
? ?{
#? ? ? ?$i=imagecreate($width,$height) ;
? ? ? ?$string='';
? ? ? ?for($j=0;$j<$num;$j )
? ? ??{##?#. =mt_rand(0,2);
? ? ? ? ? ?switch($rand)
? ? ? ? ? ?{
? ?? $? ? ? ?{
? ?ascii=mt_rand(48,57) ;
? ? ? ? ? ? ? ?break;
? ? ? ? ? ? case 1:
? ? ?? _?? ? ? ?break;
? ? ? ? ? ? case 2 :
? ? ? ? ? ? ? ?$ascii=mt_rand(97,122);
? ? ? ? ? ? ??#; ing.=sprintf('%c' ,$ascii) ;//ascii字元解碼
? ? ? ?}
#? ?
//產(chǎn)生驗(yàn)證碼背景顏色（randbg（）：函數(shù)呼叫）
? ?
##imagefilledrectangle($i,0,0,$width,$height,randbg($i));
//產(chǎn)生隨機(jī)幹?jǐn)_（randpix（）：函數(shù)呼叫）for($j=0;$j<50;$j )
}
? ? $x=floor($width/$num)*$j 2;
? ? $y=mt_rand(3,$height-15);
? ??
? ? imagechar($i,5,$x,$y,$string[$j], randpix($i));
}
#//圖片格式##? ? $fuc ='image'.$type;
? ? $have='cotent-type:image'.$type;
? ? if(function_exists($fuc))
? ? {
#o? ? }
?#? else
#??#? ? ? ? echo '不支持圖片類型';
? ? }
? ? imagedestroy($i);
? ? return $string;
}
??
//背景顏色函數(shù)功能模組?
? ?function randbg($i)
? ?{
#? ? ? ?return imagecolorallocate($i,mt_rand5) mt_rand(135,255),mt_rand(135,255));
? ? ? ?
? ?}
//幹?jǐn)_元素或字元顏色函數(shù)功能模組?
? ?function randpix($i)
? ?{
##? ? ? randpix($i)? ?{##? ? ? color?return image,colorallocate($i,mt_rand(0,135) color?return image,colorallocate($i,mt_rand(0,135) color?return_mtallocate($i,mt_rand(0,135) color?return_mt. (0,135),mt_rand(0,135));
? ? ? ?
? ?} ??
#?>
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這是個(gè)驗(yàn)證碼類，你可以參考一下
<?php
class?Captcha
{
????private?$width;
????private?$height;
????private?$codeNum;
????private?$code;
????private?$im;
????function?__construct($width=80,?$height=20,?$codeNum=4)
????{
????????$this->width?=?$width;
????????$this->height?=?$height;
????????$this->codeNum?=?$codeNum;
????}
????function?showImg()
????{
????????//創(chuàng)建圖片
????????$this->createImg();
????????//設(shè)置干擾元素
????????$this->setDisturb();
????????//設(shè)置驗(yàn)證碼
????????$this->setCaptcha();
????????//輸出圖片
????????$this->outputImg();
????}
????function?getCaptcha()
????{
????????return?$this->code;
????}
????private?function?createImg()
????{
????????$this->im?=?imagecreatetruecolor($this->width,?$this->height);
????????$bgColor?=?imagecolorallocate($this->im,?0,?0,?0);
????????imagefill($this->im,?0,?0,?$bgColor);
????}
????private?function?setDisturb()
????{
????????$area?=?($this->width?*?$this->height)?/?20;
????????$disturbNum?=?($area?>?250)???250?:?$area;
????????//加入點(diǎn)干擾
????????for?($i?=?0;?$i?<?$disturbNum;?$i++)?{
????????????$color?=?imagecolorallocate($this->im,?rand(0,?255),?rand(0,?255),?rand(0,?255));
????????????imagesetpixel($this->im,?rand(1,?$this->width?-?2),?rand(1,?$this->height?-?2),?$color);
????????}
????????//加入弧線
????????for?($i?=?0;?$i?<=?5;?$i++)?{
????????????$color?=?imagecolorallocate($this->im,?rand(128,?255),?rand(125,?255),?rand(100,?255));
????????????imagearc($this->im,?rand(0,?$this->width),?rand(0,?$this->height),?rand(30,?300),?rand(20,?200),?50,?30,?$color);
????????}
????}
????private?function?createCode()
????{
????????$str?=?"23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
????????for?($i?=?0;?$i?<?$this->codeNum;?$i++)?{
????????????$this->code?.=?$str{rand(0,?strlen($str)?-?1)};
????????}
????}
????private?function?setCaptcha()
????{
????????$this->createCode();
????????for?($i?=?0;?$i?<?$this->codeNum;?$i++)?{
????????????$color?=?imagecolorallocate($this->im,?rand(50,?250),?rand(100,?250),?rand(128,?250));
????????????$size?=?rand(floor($this->height?/?5),?floor($this->height?/?3));
????????????$x?=?floor($this->width?/?$this->codeNum)?*?$i?+?5;
????????????$y?=?rand(0,?$this->height?-?20);
????????????imagechar($this->im,?$size,?$x,?$y,?$this->code{$i},?$color);
????????}
????}
????private?function?outputImg()
????{
????????if?(imagetypes()?&?IMG_JPG)?{
????????????header('Content-type:image/jpeg');
????????????imagejpeg($this->im);
????????}?elseif?(imagetypes()?&?IMG_GIF)?{
????????????header('Content-type:?image/gif');
????????????imagegif($this->im);
????????}?elseif?(imagetype()?&?IMG_PNG)?{
????????????header('Content-type:?image/png');
????????????imagepng($this->im);
????????}?else?{
????????????die("Don't?support?image?type!");
????????}
????}
}
//?這樣調(diào)用?新建文件
<?php
require_once?'captcha.class.php';
$captcha?=?new?Captcha(80,30,4);
$captcha->showImg();
貼出報(bào)錯(cuò)訊息啊，誰有功夫看你程式碼？ ？ ？
