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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();

Publiez le message d'erreur. Qui a le temps de lire votre code ? ? ?