【PHP】验证码Demo

来源：互联网发布：java开发工程师视频编辑：程序博客网时间：2024/06/03 20:13

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;" onclick="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

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