PHP简单验证码类
PHP #验证码 #类2012-04-30 09:26
用法：
1 | $captcha = new Captcha(array('type'=>0, 'length'=>4)); |
2 |
3 | $m = isset($_GET['m'])?trim($_GET['m']):''; |
4 |
5 | yige_setcookie($m.'verify', md5(strtoupper($captcha->verify_str)), 0); |
6 |
7 | $captcha->draw(); |
效果图：
01 | <?php |
02 | /* 一个网在线教程 http://yige.org */ |
03 |
04 | class Captcha { |
05 | |
06 | var $verify_str = "";//随机产生的字符 |
07 | var $verify_width = 0;//验证图片宽度 |
08 | var $verify_height = 22;//验证图片高度 |
09 | var $char_width = 12;//字符宽度 |
10 | var $type = 0;//字符类型 |
11 | var $length = 4;//字符长度 |
12 | |
13 | function Captcha($config = array()) { |
14 | if (count($config) > 0) { |
15 | $this->init($config); |
16 | } |
17 | $this->verify_width = $this->length * $this->char_width; |
18 | |
19 | $this->init_verify_str(); |
20 | } |
21 | |
22 | function init($config) { |
23 | foreach ($config as $key => $val) { |
24 | if (isset($this->$key)) { |
25 | $this->$key = $val; |
26 | } |
27 | } |
28 | } |
29 | |
30 | function init_verify_str() { |
31 | switch ($this->type) { |
32 | case 0: |
33 | $seed = array ('0','1','2','3','4','5','6','7','8','9'); |
34 | break; |
35 | case 1: |
36 | $seed = array ('A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'); |
37 | break; |
38 | default: |
39 | $seed = array ('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'); |
40 | } |
41 | |
42 | shuffle($seed); |
43 | $verify_arr = array_slice($seed, 0, $this->length); |
44 | $this->verify_str = implode("", $verify_arr); |
45 | } |
46 | |
47 | function draw() { |
48 | header("Pragma:no-cache"); |
49 | header("Cache-control:no-cache"); |
50 | header("Content-type: image/png"); |
51 | |
52 | $aimg = imagecreate($this->verify_width, $this->verify_height); |
53 | $back = imagecolorallocate($aimg, 251, 254, 255); |
54 | imagefilledrectangle($aimg, 0, 0, $this->verify_width - 1, $this->verify_height - 1, $back); |
55 | //$border = imagecolorallocate($aimg, 133, 153, 193); |
56 | //imagerectangle($aimg, 0, 0, $this->verify_width - 1, $this->verify_height - 1, $border); |
57 | |
58 | for ($i = 0; $i < $this->length; $i++) { |
59 | $words = imagecolorallocate($aimg, rand(20,200), rand(20,200), rand(20,200)); |
60 | $wxp = 5+$i*10+rand(1,3); |
61 | imageString($aimg, 5, $wxp, 1+rand(0,3), substr($this->verify_str,$i,1),$words); |
62 | } |
63 | |
64 | $pixcol = imagecolorallocate($aimg, rand(0,255), rand(0,255), rand(0,255)); |
65 | for ($i=0; $i<20; $i++) { |
66 | imagesetpixel($aimg,rand(2,$this->verify_width-2),rand(2,$this->verify_height-2),$pixcol); |
67 | } |
68 | |
69 | imagepng($aimg); |
70 | imagedestroy($aimg); |
71 | } |
72 | |
73 | } |
74 | ?> |
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