Very practical php verification code class, very practical php verification code_PHP tutorial

Very practical php verification code class, very practical php verification code

The examples in this article share the php verification code class for your reference, the specific content is as follows

<&#63;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); 
  } 
} 
&#63;>

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