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

<?phpheader('Content-type:text/html;charset=utf8');class Code{  // 验证码个数$number  protected $number;  // 验证码类型$codeType  protected $codeType;  // 验证码图像宽度$width  protected $width;  // 验证码$height  protected $height;  // 验证码字符串$code  protected $code;  // 图像资源$image  protected $image;    public function __construct($number=4,$codeType=0,$height=50,$width=100){    //初始化自己的成员属性    $this->number=$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;  }  /*获取验证码*/  public function getCode() {    return $this->code;  }  /*图像资源销毁*/  public function __destruct(){    imagedestroy($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, $this->lightColor());  }  /*浅色*/  protected function lightColor(){    return imagecolorallocate($this->image, mt_rand(133,255), mt_rand(133,255), mt_rand(133,255));  }  /*深色*/  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();  }}