一个php验证码生成类代码

1. class ValidationCode
2. {
3. //属性
4. private $width;
5. private $height;
6. private $codeNum;
7. private $image;
8. private $disturbColorNum; //干扰元素数目
9. private $checkCode;
10. function __construct($width=80,$height=20,$codeNum=4)
11. {
12. $this->width=$width;
13. $this->height=$height;
14. $this->codeNum=$codeNum;
15. $number=floor($width*$height/15);
16. if($number>240-$codeNum)
17. {
18. $this->disturbColorNum=240-$codeNum;
19. }else
20. {
21. $this->disturbColorNum=$number;
22. }
23. $this->checkCode=$this->createCheckcode();
24. }
25. function getCheckCode()
26. {
27. return $this->checkCode;
28. }
29. private function createImage(){
30. $this->image=imagecreatetruecolor($this->width,$this->height);
31. $backcolor=imagecolorallocate($this->image,rand(225,255),rand(225,255),rand(255,255));
32. imagefill($this->image,0,0,$backcolor);
33. $border=imagecolorallocate($this->image,0,0,0);
34. imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$border);
35. }
36. private function setDisturbColor(){
37. for($i=0;$idisturbColorNum;$i++){
38. $color=imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255));
39. imagesetpixel($this->image,rand(1,$this->width-2),rand(1,$this->height-2),$color);
40. }
41. for($i=0;$i {
42. $color=imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255));
43. imagearc($this->image,rand(-10,$this->width),rand(-10,$this->height),rand(30,300),rand(20,300),55,44,$color);
44. }
45. }
46. private function outputText($fontFace=""){
47. for($i=0;$icodeNum;$i++)
48. {
49. $fontcolor=imagecolorallocate($this->image,rand(0,128),rand(0,128),rand(0,128));
50. if($fontFace=="")
51. {
52. $fontsize=rand(3,5);
53. $x=floor($this->width/$this->codeNum)*$i+5;
54. $y=rand(0,$this->height-15);
55. imagechar($this->image,$fontsize,$x,$y,$this->checkCode{$i},$fontcolor);
56. }
57. else
58. {
59. $fontsize=rand(12,16);
60. $x=floor(($this->width-8)/$this->codeNum)*$i+8;
61. $y=rand($fontsize,$this->height-8);
62. imagettftext($this->image,$fontsize,rand(-45,45),$x,$y,$fontcolor,$fontFace,$this->checkCode{$i});
63. }
64. }
65. }
67. private function createCheckCode(){
68. $code="23456789abcdefghijkmnpqrstuvwrst";
69. $str="";
70. for($i=0;$icodeNum;$i++)
71. {
72. $char=$code{rand(0,strlen($code)-1)};
73. $str.=$char;
74. }
75. return $str;
76. }
77. private function outputImage()
78. {
79. if(imagetypes()&IMG_GIF)
80. {
81. header("Content-Type:image/gif");
82. imagepng($this->image);
83. }else if(imagetypes()&IMG_JPG)
84. {
85. header("Content-Type:image/jpeg");
86. imagepng($this->image);
87. }else if(imagetypes()&IMG_PNG)
88. {
89. header("Content-Type:image/png");
90. imagepng($this->image);
91. }else if(imagetypes()&IMG_WBMP){
92. header("Content-Type:image/vnd.wap.wbmp");
93. imagepng($this->image);
94. }else
95. {
96. die("PHP不支持图片验证码");
97. }
98. }
99. //通过该方法向浏览器输出图像
100. function showImage($fontFace="")
101. {
102. //创建图像背景
103. $this->createImage();
104. //设置干扰元素
105. $this->setDisturbColor();
106. //向图像中随机画出文本
107. $this->outputText($fontFace);
108. //输出图像
109. $this->outputImage();
110. }
112. function __destruct()
113. {
114. imagedestroy($this->image);
115. }
116. }
117. function checklogin(){
118. if(empty($_POST['name']))
119. die( '用户名不能为空');
120. if(empty($_POST['password']))
121. die("密码不能为空");
122. if($_SESSION['code']!=$_POST['vertify'])
123. die("验证码输入不正确".$_SESSION['code']);
125. $username=$_POST['name'];
126. $password=md5($_POST['password']);
127. //检查是否存在
128. conndb($username,$password);
129. }
130. function conndb($name="",$ps=""){
131. $conn=mysql_connect('localhost','root','123456');
132. if(!$conn) die("数据库连接失败".mysql_error());
133. mysql_select_db('5kan',$conn) or die('选择数据库失败'.mysql_error());
134. mysql_set_charset('utf8',$conn);
135. $sql="select id from k_user where username='{$name}' and password='{$ps}'";
136. $result=mysql_query($sql) or die("SQL语句错误".mysql_error());
137. if(mysql_num_rows($result)>0) die("登录成功");
138. else die("用户名或者密码错误");
139. mysql_close($conn);
140. }
141. session_start();
142. if(!isset($_POST['randnum']))
143. {
144. $code=new ValidationCode(120,20,4);
145. $code->showImage("comicbd.ttf"); //显示在页面
146. $_SESSION['code']=$code->getCheckCode();//保存在服务器中
147. }
148. else
149. {
150. checklogin();
151. }
153. ?>

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验证码, php