这篇文章主要介绍了PHP code 验证码生成类定义和简单使用,结合实例形式分析了PHP code 验证码生成类的基本功能定义、简单使用方法及操作注意事项,需要的朋友可以参考下。

本文实例讲述了PHP code 验证码生成类定义和简单使用，分享给大家供大家参考，具体如下：

code.php

1. <?php
2. namespace code;
3. /**
4. * Class Code
5. */
6. class Code
7. {
8. protected $number;//验证码内字符个数
9. protected $codeType;//验证码样式
10. protected $width;//图像宽
11. protected $height;//图像高
12. protected $code;//验证码
13. protected $image;//图像资源
14. /**
15. * Code constructor.
16. * @param int $number
17. * @param int $codeType
18. * @param int $width
19. * @param int $height
20. */
21. public function __construct($number=5, $codeType=2, $width=100, $height=40)
22. {
23. $this->number = $number;
24. $this->codeType = $codeType;
25. $this->width = $width;
26. $this->height = $height;
27. $this->code = $this->createCode();
28. }
29. /**
30. * 销毁资源
31. */
32. public function __destruct()
33. {
34. imagedestroy($this->image);
35. }
36. /**
37. * 外部调用code时触发
38. * @param $name
39. * @return bool
40. */
41. public function __get($name)
42. {
43. if ('code' == $name) {
44. return $this->$name;
45. } else {
46. return false;
47. }
48. }
49. /**
50. * 生成code
51. */
52. protected function createCode()
53. {
54. switch ($this->codeType) {
55. case 0:
56. $code = $this->getNum();
57. break;
58. case 1:
59. $code = $this->getChar();
60. break;
61. case 2:
62. $code = $this->getNumChar();
63. break;
64. default:
65. die('样式不对');
66. }
67. return $code;
68. }
69. /**
70. * 数字验证码
71. * @return string
72. */
73. protected function getNum()
74. {
75. $str = join('', range(0,9));
76. return substr(str_shuffle($str), 0, $this->number);
77. }
78. /**
79. * 字符验证码
80. * @return string
81. */
82. protected function getChar()
83. {
84. $str = join('', range('a', 'z'));
85. $str = $str . strtoupper($str);
86. return substr(str_shuffle($str), 0, $this->number);
87. }
88. /**
89. * 字符和数字混合验证码
90. * @return string
91. */
92. protected function getNumChar()
93. {
94. $num = join('', range(0, 9));
95. $str = join('', range('a', 'z'));
96. $str_big = strtoupper($str);
97. $numChar = $num . $str . $str_big;
98. return substr(str_shuffle($numChar), 0, $this->number);
99. }
100. /**
101. * 生成图像
102. */
103. protected function createImage()
104. {
105. $this->image = imagecreatetruecolor($this->width, $this->height);
106. }
107. /**
108. * 填充背景色
109. */
110. protected function fillColor()
111. {
112. imagefill($this->image, 0, 0, $this->lightColor());
113. }
114. /**
115. * 浅颜色
116. * @return int
117. */
118. protected function lightColor()
119. {
120. return imagecolorallocate($this->image, mt_rand(170, 255), mt_rand(170, 255), mt_rand(170, 255));
121. }
122. /**
123. * 深颜色
124. * @return int
125. */
126. protected function darkColor()
127. {
128. return imagecolorallocate($this->image, mt_rand(0, 120), mt_rand(0, 120), mt_rand(0, 120));
129. }
130. /**
131. * 添加验证码字符
132. */
133. protected function drawChar()
134. {
135. $width = ceil($this->width/$this->number);
136. for ($i = 0; $i < $this->number; $i++) {
137. $x = mt_rand($i * ($width - 5), ($i + 1) * ($width - 5));
138. $y = mt_rand(0, $this->height - 15);
139. imagechar($this->image, 5, $x, $y, $this->code[$i], $this->darkColor());
140. }
141. }
142. /**
143. * 添加干扰点
144. */
145. protected function drawDisturb()
146. {
147. for ($i= 0; $i < 100; $i++) {
148. imagesetpixel($this->image, mt_rand(0, $this->width), mt_rand(0, $this->height), $this->darkColor());
149. }
150. }
151. /**
152. * 添加干扰线
153. */
154. protected function drawArc()
155. {
156. for ($i = 0; $i < $this->number - 3; $i++) {
157. imagearc($this->image, mt_rand(5, $this->width), mt_rand(5, $this->height), mt_rand(5, $this->width), mt_rand(5, $this->height),mt_rand(0, 70), mt_rand(300, 360), $this->darkColor());
158. }
159. }
160. /**
161. * 输出显示
162. */
163. protected function show()
164. {
165. header('Content-Type:image/png');
166. imagepng($this->image);
167. }
168. /**
169. * 外部image
170. */
171. public function outImage()
172. {
173. $this->createImage();//创建画布
174. $this->fillColor();//填充背景色
175. $this->drawChar();//添加验证字符
176. $this->drawDisturb();//添加干扰点
177. $this->drawArc();//添加干扰线
178. $this->show();//输出
179. }
180. }

展示验证码，保存验证码和过期时间：

1. <?php
2. include './code/Code.php';
3. $code = new code\Code();
4. $code->outImage();
5. session_start();
6. $_SESSION['code'] = [
7. 'code' => $code->code,
8. 'exp_time' => time() + (60 * 60 * 10),
9. ];