PHP实现适用于自定义的验证码类

本文实例为大家分享了PHP验证码类，利用对象来实现的验证码类，供大家参考，具体内容如下

    <?php

    /* 
     * To change this license header, choose License Headers in Project Properties.
     * To change this template file, choose Tools | Templates
     * and open the template in the editor.
     */
    Class Image{

     private $img;
     public $width = 85;
     public $height = 25;
     public $code;
     public $code_len = 4;
     public $code_str = "329832983DSDSKDSLKQWEWQ2lkfDSFSDjfdsfdsjwlkfj93290KFDSKJFDSOIDSLK";
     public $bg_color = '#DCDCDC';
     public $font_size = 16;
     public $font = 'font.ttf';
     public $font_color = '#000000';

     //创建验证码饿字符创
     public function create_code(){
      $code = '';
      for( $i=0;$i<$this->code_len;$i++ ){
       $code .= $this->code_str[mt_rand(0, strlen($this->code_str)-1)];
     }
      return $this->code = $code;
     }

     //输出图像
     public function getImage(){
      $w = $this->width;
      $h = $this->height;
      $bg_color = $this->bg_color;
      $img = imagecreatetruecolor($w, $h);
      $bg_color = imagecolorallocate($img, 
     hexdec(substr($bg_color, 1,2)), hexdec(substr($bg_color, 3,2)), hexdec(substr($bg_color, 5,2)));
     imagefill($img, 0, 0, $bg_color);
      $this->img = $img;
      $this->create_font();
      $this->create_pix();
     $this->show_code();
     }


     //写入验证码
     public function create_font(){
      $this->create_code();
      $color = $this->font_color;
      $font_color = imagecolorallocate($this->img, hexdec(substr($color,1,2)), hexdec(substr($color, 3,2)), hexdec(substr($color,5,2)));
      $x = $this->width/$this->code_len;
      for( $i=0;$i<$this->code_len;$i++ ){
       $txt_color = imagecolorallocate($this->img, mt_rand(0,100), mt_rand(0, 150), mt_rand(0, 200));
       imagettftext($this->img, $this->font_size, mt_rand(-30, 30), $x*$i+mt_rand(3, 6), mt_rand($this->height/1.2, $this->height), $txt_color, $this->font , $this->code[$i]); 
       //imagestring($this->img, $this->font_size, $x*$i+mt_rand(3, 6),mt_rand(0, $this->height/4) , $this->code[$i], $font_color);
      }
      $this->font_color = $font_color;
     }

     //画干扰线
     public function create_pix(){
      $pix_color= $this->font_color;
      for($i=0;$i<100;$i++){
       imagesetpixel($this->img, mt_rand(0, $this->width),mt_rand(0, $this->height), $pix_color);
      }
      for($j=0;$j<4;$j++){
       imagesetthickness($this->img, mt_rand(1, 2));
       imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $pix_color);
      }
     }

     //得到验证码
     public function getCode(){
      return strtoupper($this->code);
     }


     //输出验证码
     private function show_code(){
      header("Content-type:image/png");
      imagepng($this->img);
      imagedestroy($this->img);
     }
    }

效果图：

精彩专题分享：ASP.NET验证码大全 PHP验证码大全 java验证码大全

以上就是使用对象编写的验证码类的全部内容，希望对大家学习PHP程序设计有所帮助。