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【转】验证码类

news 来源：原创 2024/5/3 8:28:27

经典的php验证码类，随笔记一下，以后用的上的时候方便查找。

封装的captcha.class.php

 1 <?php 
 2 class captcha{
 3     private $width;//宽
 4     private $height;//高
 5     private $codeNum;//数量
 6     private $code;//码
 7     private $im;//图
 8  
 9     function __construct($width=80, $height=20, $codeNum=4)
10     {
11         $this->width = $width;
12         $this->height = $height;
13         $this->codeNum = $codeNum;
14     }
15  
16     function showImg()
17     {
18         //创建图片
19         $this->createImg();
20         //设置干扰元素
21         $this->setDisturb();
22         //设置验证码
23         $this->setCaptcha();
24         //输出图片
25         $this->outputImg();
26     }
27  
28     function getCaptcha()
29     {
30         return $this->code;
31     }
32  
33     private function createImg()
34     {
35         $this->im = imagecreatetruecolor($this->width, $this->height);
36         $bgColor = imagecolorallocate($this->im, 0, 0, 0);
37         imagefill($this->im, 0, 0, $bgColor);
38     }
39  
40     private function setDisturb()
41     {
42         $area = ($this->width * $this->height) / 20;
43         $disturbNum = ($area > 250) ? 250 : $area;
44         //加入点干扰
45         for ($i = 0; $i < $disturbNum; $i++) {
46             $color = imagecolorallocate($this->im, rand(0, 255), rand(0, 255), rand(0, 255));
47             imagesetpixel($this->im, rand(1, $this->width - 2), rand(1, $this->height - 2), $color);
48         }
49         //加入弧线
50         for ($i = 0; $i <= 5; $i++) {
51             $color = imagecolorallocate($this->im, rand(128, 255), rand(125, 255), rand(100, 255));
52             imagearc($this->im, rand(0, $this->width), rand(0, $this->height), rand(30, 300), rand(20, 200), 50, 30, $color);
53         }
54     }
55  
56     private function createCode()
57     {
58         $str = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
59  
60         for ($i = 0; $i < $this->codeNum; $i++) {
61             $this->code .= $str{rand(0, strlen($str) - 1)};
62         }
63     }
64  
65     private function setCaptcha()
66     {
67         $this->createCode();
68  
69         for ($i = 0; $i < $this->codeNum; $i++) {
70             $color = imagecolorallocate($this->im, rand(50, 250), rand(100, 250), rand(128, 250));
71             $size = rand(floor($this->height / 5), floor($this->height / 3));
72             $x = floor($this->width / $this->codeNum) * $i + 5;
73             $y = rand(0, $this->height - 20);
74             imagechar($this->im, $size, $x, $y, $this->code{$i}, $color);
75         }
76     }
77  
78     private function outputImg()
79     {
80         if (imagetypes() & IMG_JPG) {
81             header('Content-type:image/jpeg');
82             imagejpeg($this->im);
83         } elseif (imagetypes() & IMG_GIF) {
84             header('Content-type: image/gif');
85             imagegif($this->im);
86         } elseif (imagetype() & IMG_PNG) {
87             header('Content-type: image/png');
88             imagepng($this->im);
89         } else {
90             die("Don't support image type!");
91         }
92     }
93 }
94     
95 ?>

demo.php

1 <?php 
2     session_start();
3     require('captcha.class.php');
4     $captcha = new captcha(80,20,4);
5     $code = $captcha->getCaptcha();
6     $_SESSION['code'] = $code;
7     $captcha->showImg();
8 ?>