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一个php验证码生成类代码

时间:2021-07-01 10:21:17 帮助过:8人阅读

  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($i=0;$i<$this->disturbColorNum;$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<10;$i++)
  42. {
  43. $color=imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255));
  44. imagearc($this->image,rand(-10,$this->width),rand(-10,$this->height),rand(30,300),rand(20,300),55,44,$color);
  45. }
  46. }
  47. private function outputText($fontFace=""){
  48. for($i=0;$i<$this->codeNum;$i++)
  49. {
  50. $fontcolor=imagecolorallocate($this->image,rand(0,128),rand(0,128),rand(0,128));
  51. if($fontFace=="")
  52. {
  53. $fontsize=rand(3,5);
  54. $x=floor($this->width/$this->codeNum)*$i+5;
  55. $y=rand(0,$this->height-15);
  56. imagechar($this->image,$fontsize,$x,$y,$this->checkCode{$i},$fontcolor);
  57. }
  58. else
  59. {
  60. $fontsize=rand(12,16);
  61. $x=floor(($this->width-8)/$this->codeNum)*$i+8;
  62. $y=rand($fontsize,$this->height-8);
  63. imagettftext($this->image,$fontsize,rand(-45,45),$x,$y,$fontcolor,$fontFace,$this->checkCode{$i});
  64. }
  65. }
  66. }
  67. private function createCheckCode(){
  68. $code="23456789abcdefghijkmnpqrstuvwrst";
  69. $str="";
  70. for($i=0;$i<$this->codeNum;$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. $this->outputImage();
  110. }
  111. function __destruct()
  112. {
  113. imagedestroy($this->image);
  114. }
  115. }
  116. function checklogin(){
  117. if(empty($_POST['name']))
  118. die( '用户名不能为空');
  119. if(empty($_POST['password']))
  120. die("密码不能为空");
  121. if($_SESSION['code']!=$_POST['vertify'])
  122. die("验证码输入不正确".$_SESSION['code']);
  123. $username=$_POST['name'];
  124. $password=md5($_POST['password']);
  125. //检查是否存在
  126. conndb($username,$password);
  127. }
  128. function conndb($name="",$ps=""){
  129. $conn=mysql_connect('localhost','root','123456');
  130. if(!$conn) die("数据库连接失败".mysql_error());
  131. mysql_select_db('5kan',$conn) or die('选择数据库失败'.mysql_error());
  132. mysql_set_charset('utf8',$conn);
  133. $sql="select id from k_user where username='{$name}' and password='{$ps}'";
  134. $result=mysql_query($sql) or die("SQL语句错误".mysql_error());
  135. if(mysql_num_rows($result)>0) die("登录成功");
  136. else die("用户名或者密码错误");
  137. mysql_close($conn);
  138. }
  139. session_start();
  140. if(!isset($_POST['randnum']))
  141. {
  142. $code=new ValidationCode(120,20,4);
  143. $code->showImage("comicbd.ttf"); //显示在页面
  144. $_SESSION['code']=$code->getCheckCode();//保存在服务器中
  145. }
  146. else
  147. {
  148. checklogin();
  149. }
  150. ?>

验证码, php

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