加乘验证码改进的

下午活少，又刚看php的GD库不久，写个验证码练练手。

没做什么修饰，一路直下，no function，no class！

里边的函数查手册吧，完全不会的先去把php的GD库看一遍。

还是不发首页。

这是效果图：

  1 <?php
  2 session_start();
  3 /**
  4  *    一个简单的加乘验证码类
  5  *    @author 谭宁宁
  6  *    @datetime 2012-09-03
  7 */
  8 
  9 class codeimg
 10 {
 11     public $width    = 150;
 12     public $height    = 35;
 13     
 14     public $num_1    = 1;
 15     public $num_2    = 10;
 16     
 17     public $f_file    = 'font/msyhbd.ttf';
 18     public $f_size    = 13;
 19 
 20     public $c_type    = 1;    //验证码类型：1加乘混合出现/2纯加法/3纯乘法。默认为1
 21     public $imgSourc= '';
 22 
 23     public $line    = true;
 24     public $lineNum    = 0;
 25 
 26     private $sess    = '';    //存入session的值
 27     private $dev    = FALSE;//调试模式，也就是不输出header("content-type: image/png;");也不生成图片。测试的
 28 
 29     function __construct()
 30     {
 31         $this->genImg();
 32     }
 33 
 34     function genImg()
 35     {
 36         $this->imgSourc    = $this->createImgSourc();
 37         if(!self::$this->dev)
 38         {
 39             header("content-type: image/png;");
 40             imagepng($this->imgSourc);
 41             imagedestroy($this->imgSourc);
 42         }
 43     }
 44 
 45     function createImgSourc()
 46     {
 47         $this->imgSourc    = imagecreate($this->width, $this->height);
 48         $bgcolor    = imagecolorallocate($this->imgSourc, 255, 255, 255);
 49 
 50         //是否生成干扰线
 51         if($this->line)
 52         {
 53             $this->genLine();
 54         }
 55 
 56         $text    = $this->genStr();
 57         $strlen    = mb_strlen($text);
 58 
 59         $y        = intval(($this->height-$this->f_size));
 60         $x        = intval(($this->height-$strlen));
 61 
 62         $textColor    = imagecolorallocate($this->imgSourc, rand(0, 125), rand(0, 125), rand(0, 125));
 63         imagettftext($this->imgSourc, $this->f_size, 0, $x, $y, $textColor, $this->f_file, $text);
 64 
 65         return $this->imgSourc;
 66     }
 67 
 68     /**
 69      *    干扰线线的生成
 70      *    根据$this->lineNum决定生成多少条线，默认为随机生成5~12条
 71     */
 72     function genLine()
 73     {
 74         $lineNum    = empty($this->lineNum) ? rand(5, 12) : $this->lineNum;
 75         for($i = 1; $i <= $lineNum; $i++ )
 76         {
 77             $linecolor    = imagecolorallocate($this->imgSourc, rand(0 , 255), rand(0, 255), rand(0, 255));
 78             imageline($this->imgSourc, rand(1 , $this->width), rand(1, $this->height), rand(1, $this->width), rand(1, $this->height), $linecolor);
 79         }
 80     }
 81 
 82     /**
 83      *    生成图片里的内容
 84      *    @return string
 85      */
 86     function genStr()
 87     {
 88         $operArr    = array('加', '乘');
 89         $operNum    = $this->c_type === 2 ? 0 : ($this->c_type === 3 ? 1 : rand(0, 1));
 90 
 91         $numArr[0]    = rand(intval($this->num_1), intval($this->num_2));
 92         $numArr[1]    = rand(intval($this->num_1), intval($this->num_2));
 93 
 94         if($operNum === 1)
 95         {
 96             $numArr[2]    = intval($numArr[0])*intval($numArr[1]);
 97         }
 98         else
 99         {
100             $numArr[2]    = intval($numArr[0])+intval($numArr[1]);
101         }
102 
103         $temp_num    = rand(0, 2);
104         self::$this->sess    = $numArr[$temp_num];
105         $numArr[$temp_num]    = '**';
106         $string        = $numArr[0].' '.$operArr[$operNum].' '.$numArr[1].' = '.$numArr[2];
107         return $string;
108     }
109 
110     function getValue()
111     {
112         return self::$this->sess;
113     }
114 
115 }
116 header("content-type: text/html; charset=utf-8");
117 $objimg    = new codeimg();
118 $_SESSION['scode']    = $objimg->getValue();
119 ?>
posted @ 2012-09-03 17:23  cntnn11  阅读(245)  评论(0)  编辑  收藏  举报