php验证码类

来源：互联网发布：js的eval方法编辑：程序博客网时间：2024/05/18 15:07

1、Verify.class.php

/** * 验证码类 * @author mark * @since  2013-10-15 */class Verify{    private $width;    private $height;    private $codeNum;    private $code;    private $im;    function __construct($width=80, $height=30, $codeNum=4)    {        $this->width = $width;        $this->height = $height;        $this->codeNum = $codeNum;    }    function showImg()    {        //创建图片        $this->createImg();        //设置干扰元素        $this->setDisturb();        //设置验证码        $this->setCaptcha();        //输出图片        $this->outputImg();    }//获取验证码    function getCode() {    return strtolower($this->code);    }    private function createImg()    {        $this->im = imagecreatetruecolor($this->width, $this->height);        $bgColor = imagecolorallocate($this->im,  mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));        imagefill($this->im, 0, 0, $bgColor);    }    private function setDisturb()    {        $area = ($this->width * $this->height) / 20;        $disturbNum = ($area > 250) ? 250 : $area;        //加入点干扰        for ($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), $color);        }        //加入弧线        for ($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, mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));            $size = rand(floor($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!");    }        imagedestroy($this->im);    }}

2、verify.php

require_once 'salesbangV1/util/Verify.class.php';$verify = new Verify();$verify->showImg();$_SESSION["verifyCode"] = $verify->getCode();//验证码保存到SESSION中

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