一个实用的php验证码类

万能php验证码类，供大家参考，具体内容如下

code.php是验证码类，类的名称最好和文件名的名称一样，这样有利于我们的查看。

code.php

number=$number;
    $this->codeType=$codeType;
    $this->width = $width;
    $this->height= $height;
    
    //生成验证码函数
    $this->code = $this ->createCode();
    
  }
  public function __get($name){
    if ($name == 'code'){
      return $this->code;
    }
    return false;
  }
  
  public function getCode() {
    return $this->code;
  }
  
  public function __destruct(){
    imagedestroy($this->image);
  }
  protected function createCode(){
    //通过你的验证码类型生成验证码
    switch ($this->codeType){
      case 0: //纯数字
 $code = $this->getNumberCode();
 break;
      case 1: //纯字母的
 $code = $this->getCharCode();
 break;
      case 2: //数字和字母混合
 $code = $this->getNumCharCode();
 break;
      default:
 die('不支持此类验证码类型');
    }
    return $code;
  }
  protected function getNumberCode(){
    $str = join('', range(0, 9));
    return substr(str_shuffle($str),0, $this->number);
  }
  protected function getCharCode(){
    $str = join('', range('a', 'z'));
    $str = $str.strtoupper($str);
    return substr(str_shuffle($str),0,$this->number);
  }
  protected function getNumCharCode(){
    $numstr = join('',range(0, 9));
    $str =join('', range('a', 'z'));
    $str =$numstr.$str.strtoupper($str);
    return substr(str_shuffle($str), 0,$this->number);
  }
  protected function createImage(){
    $this->image = imagecreatetruecolor($this->width, 
 $this->height);
  }
  protected function fillBack(){
    imagefill($this->image, 0, 0, $this->lightColor());
  }
  
  protected function lightColor(){
    return imagecolorallocate($this->image, mt_rand(133,255), mt_rand(133,255), mt_rand(133,255));
  }
  
  protected function darkColor(){
    return imagecolorallocate($this->image, mt_rand(0,120), mt_rand(0,120), mt_rand(0,120));
  }
  protected function drawChar(){
    $width = ceil($this->width / $this->number);
    for ($i=0; $i< $this->number;$i++){
      $x = mt_rand($i*$width+5, ($i+1)*$width-10);
      $y = mt_rand(0, $this->height -15);
      imagechar($this->image, 5, $x, $y, $this->code[$i], $this->darkColor());
    }
  }
  protected function drawLine(){
    for ($i=0;$i<5;$i++) {
      imageline($this->image,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$this->darkColor());
    }
  }
  protected function drawDisturb(){
    for ($i=0;$i<150;$i++){
      $x=mt_rand(0, $this->width);
      $y=mt_rand(0, $this->height);
      imagesetpixel($this->image, $x, $y, $this->lightColor());
    }
  }
  protected function show(){
    header('Content-Type:image/png');
    imagepng($this->image);
  }
  public function outImage(){
//     创建画布
    $this->createImage();
//     填充背景色
    $this->fillBack();
//     将验证码字符串花到画布上
    $this->drawChar();
//     添加干扰元素
    $this->drawDisturb();
//     添加线条
    $this->drawLine();
//     输出并显示
    $this->show();
  }
}

test.php是new一个新的验证码，并把它保存到session中，为我们验证码的验证起到保存和存储的作用。

test.php

getCode();
$code->outImage();

login.php就是最后的验证。

login.php

 
   
   
     
       
       
       
 *{margin:0px;padding:0px;} 
 ul{ 
   width:400px; 
   list-style:none; 
   margin:50px auto; 
 } 
  
 li{ 
   padding:12px; 
   position:relative; 
 } 
  
 label{ 
   width:80px; 
   display:inline-block; 
   float:left; 
   line-height:30px; 
 } 
  
 input[type='text'],input[type='password']{ 
   height:30px; 
 } 
  
 img{ 
   margin-left:10px; 
 } 
  
 input[type="submit"]{ 
   margin-left:80px; 
   padding:5px 10px; 
 } 
       
     
     

     
  

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。