样品图片：
样例地址：http://xhua521.cn/DemoFolder/VerificationCode/index.php
1.Vcode.class.php文件
<?php /** * 生成验证码类 */ class Vcode { private $height; private $width; private $codeNum; private $disturbColorNum; private $lineNum; private $type; private $checkCode; private $image; /*构造函数为属性赋初值*/ function __construct($height=100,$width=200,$codeNum=4,$disturbColorNum=50,$lineNum=4,$type=1) { $this->height = $height; $this->width = $width; $this->codeNum = $codeNum; $this->disturbColorNum = $disturbColorNum; $number = floor($height*$width/15); if($number > 240-$codeNum){ $this->disturbColorNum = 240-$codeNum; }else { $this->disturbColorNum = $number; } $this->lineNum = $lineNum; $this->checkCode = $this->createCheckCode($type); } function __tostring() { $_SESSION['code'] = strtoupper($this->checkCode); $this->outImg(); return ''; } /*生成验证的过程*/ function outImg() { $this->getCreateImage(); //1.创建画布 $this->setDisturbColor(); //2.设置干扰 $this->outputText(); //3.添加字符 $this->outputImage(); //4.输出图片 } function getCreateImage() { $this->image = imagecreatetruecolor($this->width,$this->height); $backColor = imagecolorallocate($this->image,255,255,255); @imagefill($this->image,0,0,$backColor); $border = imagecolorallocate($this->image,255,0,0); imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$border); } /*获得纯数字掺字母验证码的串*/ private function createCheckCode($type) { $type = intval($type); if($type<1) $type = 1; if($type>3) $type = 3; $codeStr = ""; switch ($type) { case 1: $code = "3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKMNPQRSTUVWXY"; break; case 2: $code = "1234567890"; break; case 3: $code = "abcdefghijkmnpqrstuvwxyABCDEFGHIJKMNPQRSTUVWXY"; break; default: $code = "3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKMNPQRSTUVWXY"; break; } for ($i=0; $i < $this->codeNum; $i++) { $char = $code[rand(0,strlen($code)-1)]; $codeStr .= $char; } return $codeStr; } function setDisturbColor() { for ($i=0; $i < $this->disturbColorNum; $i++) { $color = imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)); imagesetpixel($this->image,mt_rand(1,$this->width-2),mt_rand(1,$this->height-2),$color); } for ($i=0; $i < $this->lineNum; $i++) { $color = imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)); imagearc($this->image,rand(-10,$this->width),rand(-10,$this->height),rand(30,300),rand(20,200),55,44,$color); } } function outputText() { for ($i=0; $i < $this->codeNum; $i++) { $fontColor = imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)); $fontSize = mt_rand(30,35); $x = floor($this->width/$this->codeNum)*$i+3; $y = mt_rand(0,$this->height-imagefontheight($fontSize)); imagechar($this->image,$fontSize,$x,$y,$this->checkCode[$i],$fontColor); } } function outputImage(){ if (imagetypes() & IMG_GIF) { header("Content-type:image/gif"); imagegif($this->image); }elseif (imagetypes() & IMG_JPG) { header("Content-type:image/jpeg"); imagejpeg($this->image); }elseif (imagetypes() & IMG_PNG) { header("Content-type:image:png"); imagepng($this->image); }else { die("PHP不支持图像创建！"); } } function __destruct() { imagedestroy($this->image); } } ?> 2.imagecode.php文件（在Vcode的参数可以修改分别表示 高、宽、验证码字符串、杂点数、线条数、验证码类型【1:字母数字 2:数字 3:字母】） <?php session_start(); require('./Vcode.class.php'); echo new Vcode(50,130,4,50,4,1); ?> 3.index.php文件 <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>php生成验证码Demo</title> <script type="text/javascript"> function newgdcode(obj,url){ obj.src = url + '?nowtime='+new Date().getTime(); } </script> </head> <body> <a href="../index.html">返回Demo列表</a> <br/> <img src="./imgcode.php" alt="验证码" style="cursor:pointer;" οnclick="javascript:newgdcode(this,this.src);" > <?php session_start(); if(isset($_POST['submit'])){ if(strtoupper($_POST['code']) == $_SESSION['code']){ echo "<br/>验证成功！"; }else { echo "<br/>验证失败！"; } } ?> <form class="" action="index.php" method="post"> <input type="text" name="code" value=""> <input type="submit" name="submit" value="提交"> </form> </body> </html>如果代码中有问题请及时向我提出~！ 样例地址： http://xhua521.cn/DemoFolder/VerificationCode/index.php
