PHP制作验证码

 1: 
        

         Copy after login
        
       

 2: /*

 3: * file:myvcode.class.php

 4: * 验证码类,类名Vcode

 5: */

 6: class Vcode

 7: {

 8: private $width; /*验证码宽度*/

 9: private $height; /*验证码高度*/

 10: private $codeNum; /*验证码字符个数*/

 11: private $checkCode; /*验证码字符*/

 12: private $image; /*验证码资源*/

 13: private $pixNum; /*绘制干扰点的个数*/

 14: private $lineNum; /*绘制干扰线的条数*/

 15:

 16: /*

 17:  *构造方法实例化验证码对象，并初始化数据

 18:  *@param int $width 设置默认宽度

 19:  *@param int $height 设置默认高度

 20:  *@param int $codeNum 设置验证码中的字符个数

 21:  *@param int $pixNum 设置干扰点的个数

 22:  *@param int $lineNum 设置干扰线的数量

 23:  */

 24: function __construct($width=80,$height=40,$codeNum=4,$pixNum=40,$lineNum=5)

 25: {

 26: $this->width = $width;

 27: $this->height = $height;

 28: $this->codeNum = $codeNum;

 29: $this->pixNum = $pixNum;

 30: $this->lineNum = $lineNum;

 31: }

 32: /*内部私有方法,创建图像资源*/

 33: private function getCreateImage()

 34: {

 35: $this->image = imagecreatetruecolor($this->width, $this->height);

 36: $white = imagecolorallocate($this->image,0xff,0xff,0xff);

 37: imagefill($this->image, 0, 0, $white);

 38: $black = imagecolorallocate($this->image,0,0,0);

 39: imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $black);

 40: }

 41: /*内部私有方法,绘制字符，去掉o0Llz和012*/

 42: private function createCheckCode()

 43: {

 44: $code = '3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKMNPQRSTUVWXY';

 45: $this->checkCode = "";

 46: for($i=0; $icodeNum;$i++)

 47: {

 48: $char = $code{rand(0,strlen($code) - 1)};

 49: $this->checkCode .= $char;

 50: $fontColor = imagecolorallocate($this->image, rand(0,128), rand(0,128),rand(0,128));

 51: $fontSize = rand(3,5);

 52: $x = rand(0,$this->width-imagefontwidth($fontSize));

 53: $y = rand(0,$this->height-imagefontheight($fontSize));

 54: imagechar($this->image, $fontSize, $x, $y, $char, $fontColor);

 55: }

 56: }

 57: /*内部私有方法设置干扰元素*/

 58: private function setDisturbColor()

 59: {

 60: /*绘制干扰点*/

 61: for($i=0; $ipixNum; $i++)

 62: {

 63: $color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));

 64: imagesetpixel($this->image, rand(1,$this->width-2), rand(1,$this->height-2), $color);

 65: }

 66: /*绘制干扰线*/

 67: for($i=0; $ilineNum; $i++)

 68: {

 69: $color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));

 71: }

 72: }

 73: /*开启session保存 利用echo 输出图像*/

 74: function __toString()

 75: {

 76: $_SESSION['code'] = strtoupper($this->checkCode);

 77: $this->getCreateImage();

 78: $this->createCheckCode();

 79: $this->setDisturbColor();

 80: $this->outputImg();

 81: }

 82: /*内部私有方法输出图像*/

 83: private function outputImg()

 84: {

 85: header("content-type:image/png");

 86: imagepng($this->image);

 87: }

 88: /*析构方法，释放对象*/

 89: function __destruct()

 90: {

 91: imagedestroy($this->image);

 92: }

 93: }

 94: ?>