【PHP】验证码Demo

样品图片：

样例地址：http://xhua521.cn/DemoFolder/VerificationCode/index.php

1.Vcode.class.php文件

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】）

3.index.php文件

  
    
    
    
  
  
    返回Demo列表 
    
   
    
    验证成功！";
      }else {
        echo "
验证失败！";
      }
    }
    ?>
    

      
      
    
  

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