非常实用的php验证码类

本文实例为大家分享了php验证码类，供大家参考，具体内容如下

    <?php 
    /** 
     * 
     * @author Administrator 
     * 
     */ 
    class ValidateCode{ 

      private $width; 
      private $height; 
      private $codeNum; 
      private $img_resouce; 
      private $disturbColorNum; 
      private $checkCode; 

      function __construct($width=80,$height=20,$codeNum=4) { 
        $this->width=$width; 
        $this->height=$height; 
        $this->codeNum=$codeNum; 
        $this->checkCode=$this->CreateCheckCode(); 
        $number=floor($width*$height/25); 
        if ($number>240-$codeNum) { 
          $this->disturbColorNum=240-$codeNum; 
        }else{ 
          $this->disturbColorNum=$number; 
        } 
      } 

      public function showImage($fontpath='') { 
        //创建图像背景 
        $this->Img_resouce(); 
        //var_dump($img_resouce); 
        //设置干扰元素 
        $this->setDistructcolor(); 
        //向图像中随机画出文本 
        $this->outputtext($fontpath); 
        //输出图像 
        $this->outputimage(); 
      } 
      /** 
       * 
       *获取随机创建的验证码 
       */ 
      public function getCheckCode(){ 

      } 
      private function Img_resouce(){ 
        //创建一个真彩图像 
        $this->img_resouce=imagecreatetruecolor($this->width,$this->height); 
        //随机设置图像背景 
        $backcolor=imagecolorallocate($this->img_resouce,rand(225,255),rand(225,255),rand(225,255)); 
        //填充颜色 
        imagefill($this->img_resouce, 0, 0, $backcolor); 
        //设置边框背景 
        $border=imagecolorallocate($this->img_resouce, 0,0,0); 
        //画一个矩形 
        imagerectangle($this->img_resouce,0,0,$this->width-1,$this->height-1,$border); 
      } 
      private function setDistructcolor(){ 
        //绘画干扰点 
        for ($i = 0; $i <$this->disturbColorNum; $i++) { 

          imagesetpixel($this->img_resouce, rand(1, $this->width-2), rand(1, $this->height-2), rand(0,255)); 
        } 

        //绘画干扰线 
        for ($j = 0; $j <3; $j++) { 
          $linecolor=imagecolorallocate($this->img_resouce,rand(0,255),rand(0,255),rand(0,255)); 
          imagearc($this->img_resouce, rand(0,$this->width), rand(0,$this->height), 
           rand(10, 225), rand(20, 150), 
           55, 44, $linecolor); 
        } 
      } 
      private function CreateCheckCode(){ 
        $code='23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ'; 
        $string=''; 
        for ($i = 0; $i < $this->codeNum; $i++) { 

          $char=$code{rand(0, strlen($code)-1)}; 
          $string.=$char; 
        } 
        return $string; 
      } 
      private function outputtext($fontpath=''){ 
        for ($i = 0; $i < $this->codeNum; $i++) { 
          $fontcolor=imagecolorallocate($this->img_resouce, rand(0,128), rand(0, 128), rand(0, 128)); 
          if ($fontpath=='') { 

             $fontsize=rand(3, 5); 
             $x=floor($this->width/$this->codeNum)*$i+3; 
             $y=rand(0, $this->height-20); 
             imagechar($this->img_resouce, $fontsize, $x, $y, $this->checkCode{$i}, $fontcolor); 
        }else{ 
             $fontsize=rand(12, 16); 
             $x=floor(($this->width-8)/$this->codeNum)*$i+8; 
             $y=rand($fontsize, $this->height-15); 
             imagettftext($this->img_resouce,$fontsize,rand(-45,45),$x,$y,$fontcolor,fontpath,$this->checkCode{$i}); 
           } 
        } 
      } 
      private function outputimage() { 

        if (imagetypes() & IMG_GIF) { 
          header("Content-type: image/gif"); 
          imagegif($this->img_resouce); 
        }else if(imagetypes() & IMG_JPEG) { 
          header("Content-type: image/jpeg"); 
          imagejpeg($this->img_resouce); 
        }else if(imagetypes() & IMG_PNG) { 
          header("Content-type: image/png"); 
          imagepng($this->img_resouce); 
        }else { 
          echo "PHP不支持的类型"; 
        } 


      } 
      private function __destruct(){ 

        imagedestroy($this->img_resouce); 
      } 
    } 
    ?>

以上就是本文的全部内容，希望对大家的学习有所帮助。