1 <?php
2 //验证码类
3 class ValidateCode {
4 private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子
5 private $code;//验证码
6 private $codelen = 4;//验证码长度
7 private $width = 130;//宽度
8 private $height = 50;//高度
9 private $img;//图形资源句柄
10 private $font;//指定的字体
11 private $fontsize = 20;//指定字体大小
12 private $fontcolor;//指定字体颜色
13
14 //构造方法初始化
15 public function __construct() {
16 $this->font = dirname(__FILE__).'/Elephant.ttf';//注意字体路径要写对，否则显示不了图片
17 }
18
19 //生成随机码
20 private function createCode() {
21 $_len = strlen($this->charset)-1;
22 for ($i=0;$i<$this->codelen;$i++) {
23 $this->code .= $this->charset[mt_rand(0,$_len)];
24 }
25 }
26
27 //生成背景
28 private function createBg() {
29 $this->img = imagecreatetruecolor($this->width, $this->height);
30 $color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
31 imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);
32 }
33 //生成文字
34 private function createFont() {
35 $_x = $this->width / $this->codelen;
36 for ($i=0;$i<$this->codelen;$i++) {
37 $this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
38 imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);
39 }
40 }
41 //生成线条、雪花
42 private function createLine() {
43 //线条
44 for ($i=0;$i<6;$i++) {
45 $color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
46 imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
47 }
48 //雪花
49 for ($i=0;$i<100;$i++) {
50 $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
51 imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
52 }
53 }
54 //输出
55 private function outPut() {
56 header('Content-type:image/png');
57 imagepng($this->img);
58 imagedestroy($this->img);
59 }
60
61 //对外生成
62 public function doimg() {
63 $this->createBg();
64 $this->createCode();
65 $this->createLine();
66 $this->createFont();
67 $this->outPut();
68 }
69
70 //获取验证码
71 public function getCode() {
72 return strtolower($this->code);
73 }
74 }
75 ?>
