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phpsession验证码不一致总显示上次验证码的解决方法

时间：2021-07-01 10:21:17 帮助过：10人阅读

  3. $(".login").live('click',function(){

  4. var username=$(".input_user").val();
  5. var password=$(".input_ps").val();
  6. var code=$('.input_checkcode').val();
  7. if(username==""){
  8. alert("用户名不能为空");
  9. return false;
  10. }
  11. if(password==""){
  12. alert("密码不能为空");
  13. return false;
  14. }

  15. var URL="checkLogin.php?";

  16. var DATA="&username="+username+"&password="+password+"&code="+code;
  17. $.getJSON(URL+DATA,function(json){
  18. if(json.code=='code_error'){
  19. alert('验证码错误，请重新输入验证码');
  20. }
  21. if(json.username=='true_u'&&json.password=='true_p'){
  22. //alert(json.username+"|"+username+'...1');
  23. window.location="index.php";
  24. }
  25. if(json.username=='error_u'||json.password=='error_p'){
  26. alert("用户名输入或密码输入有误，请检查后重新登陆!");
  27. window.location="login.php";
  28. }
  29. });
  30. });

后台checkLogin.php关键代码：

  2. $code=$_GET['code'];
  3. if($code!=$_SESSION['captchaCode']['content'])
  4. {$adminInfo['code']='code_error';};
  6. if($row['username']==$username&&$row['password']==$password){
  8. $_SESSION['username']=$row['username'];
  9. $adminInfo['username']='true_u';
  10. $adminInfo['password']='true_p';
  11. mysql_close();
  12. }else
  13. if($row['username']!=$username){
  14. $adminInfo['username']='error_u';
  15. }
  16. if($row['password']!=$password){
  17. $adminInfo['password']='error_p';
  18. }
  20. //var_dump($adminInfo);exit;
  21. echo json_encode($adminInfo);

具体如下： checkCode.class.php//验证码

  2. /*
  3. * Captcha Class base on PHP GD Lib
  4. * @author Design
  5. * @version 1.0
  6. * @copyright js8.in 2010 bbs.it-home.org
  7. * @demo
  8. * include('captchaClass.php');
  9. * $captchaDemo=new Captcha();
  10. * $captchaDemo->createImage();
  11. */
  12. class Captcha{
  13. //@定义验证码图片高度
  14. private $height;
  15. //@定义验证码图片宽度
  16. private $width;
  17. //@定义验证码字符个数
  18. private $textNum;
  19. //@定义验证码字符内容
  20. private $textContent;
  21. //@定义字符颜色
  22. private $fontColor;
  23. //@定义随机出的文字颜色
  24. private $randFontColor;
  25. //@定义字体大小
  26. private $fontSize;
  27. //@定义字体
  28. private $fontFamily;
  29. //@定义背景颜色
  30. private $bgColor;
  31. //@定义随机出的背景颜色
  32. private $randBgColor;
  33. //@定义字符语言
  34. private $textLang;
  35. //@定义干扰点数量
  36. private $noisePoint;
  37. //@定义干扰线数量
  38. private $noiseLine;
  39. //@定义是否扭曲
  40. private $distortion;
  41. //@定义扭曲图片源
  42. private $distortionImage;
  43. //@定义是否有边框
  44. private $showBorder;
  45. //@定义验证码图片源
  46. private $image;
  48. //@Constructor 构造函数
  49. public function Captcha(){
  50. $this->textNum=4;
  51. $this->fontSize=16;
  52. $this->fontFamily='c:\\windows\\fonts\SIMYOU.ttf';//设置中文字体，可以改成linux的目录
  53. $this->textLang='en';
  54. $this->noisePoint=30;
  55. $this->noiseLine=3;
  56. $this->distortion=false;
  57. $this->showBorder=false;
  58. }
  60. //@设置图片宽度
  61. public function setWidth($w){
  62. $this->width=$w;
  63. }
  65. //@设置图片高度
  66. public function setHeight($h){
  67. $this->height=$h;
  68. }
  70. //@设置字符个数
  71. public function setTextNumber($textN){
  72. $this->textNum=$textN;
  73. }
  75. //@设置字符颜色
  76. public function setFontColor($fc){
  77. $this->fontColor=sscanf($fc,'#%2x%2x%2x');
  78. }
  80. //@设置字号
  81. public function setFontSize($n){
  82. $this->fontSize=$n;
  83. }
  85. //@设置字体
  86. public function setFontFamily($ffUrl){
  87. $this->fontFamily=$ffUrl;
  88. }
  90. //@设置字符语言
  91. public function setTextLang($lang){
  92. $this->textLang=$lang;
  93. }
  95. //@设置图片背景
  96. public function setBgColor($bc){
  97. $this->bgColor=sscanf($bc,'#%2x%2x%2x');
  98. }
  100. //@设置干扰点数量
  101. public function setNoisePoint($n){
  102. $this->noisePoint=$n;
  103. }
  105. //@设置干扰线数量
  106. public function setNoiseLine($n){
  107. $this->noiseLine=$n;
  108. }
  110. //@设置是否扭曲
  111. public function setDistortion($b){
  112. $this->distortion=$b;
  113. }
  115. //@设置是否显示边框
  116. public function setShowBorder($border){
  117. $this->showBorder=$border;
  118. }
  120. //@初始化验证码图片
  121. public function initImage(){
  122. if(empty($this->width)){$this->width=floor($this->fontSize*1.3)*$this->textNum+10;}
  123. if(empty($this->height)){$this->height=$this->fontSize*2;}
  124. $this->image=imagecreatetruecolor($this->width,$this->height);
  125. if(empty($this->bgColor)){
  126. $this->randBgColor=imagecolorallocate($this->image,mt_rand(100,255),mt_rand(100,255),mt_rand(100,255));
  127. }else{
  128. $this->randBgColor=imagecolorallocate($this->image,$this->bgColor[0],$this->bgColor[1],$this->bgColor[2]);
  129. }
  130. imagefill($this->image,0,0,$this->randBgColor);
  131. }
  133. //@产生随机字符
  134. public function randText($type){
  135. $string='';
  136. switch($type){
  137. case 'en':
  138. $str='ABCDEFGHJKLMNPQRSTUVWXY3456789';
  139. for($i=0;$i<$this->textNum;$i++){
  140. $string=$string.','.$str[mt_rand(0,29)];
  141. }
  142. break;
  143. case 'cn':
  144. for($i=0;$i<$this->textNum;$i++) {
  145. $string=$string.','.chr(rand(0xB0,0xCC)).chr(rand(0xA1,0xBB));
  146. }
  147. $string=iconv('GB2312','UTF-8',$string); //转换编码到utf8
  148. break;
  149. }
  150. return substr($string,1);
  151. }
  153. //@输出文字到验证码
  154. public function createText(){
  155. $textArray=explode(',',$this->randText($this->textLang));
  156. $this->textContent=join('',$textArray);
  157. if(empty($this->fontColor)){
  158. $this->randFontColor=imagecolorallocate($this->image,mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));
  159. }else{
  160. $this->randFontColor=imagecolorallocate($this->image,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
  161. }
  162. for($i=0;$i<$this->textNum;$i++){
  163. $angle=mt_rand(-1,1)*mt_rand(1,20);
  164. imagettftext($this->image,$this->fontSize,$angle,5+$i*floor($this->fontSize*1.3),floor($this->height*0.75),$this->randFontColor,$this->fontFamily,$textArray[$i]);
  165. }
  166. }
  168. //@生成干扰点
  169. public function createNoisePoint(){
  170. for($i=0;$i<$this->noisePoint;$i++){
  171. $pointColor=imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
  172. imagesetpixel($this->image,mt_rand(0,$this->width),mt_rand(0,$this->height),$pointColor);
  173. }
  175. }
  177. //@产生干扰线
  178. public function createNoiseLine(){
  179. for($i=0;$i<$this->noiseLine;$i++) {
  180. $lineColor=imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),20);
  181. imageline($this->image,0,mt_rand(0,$this->width),$this->width,mt_rand(0,$this->height),$lineColor);
  182. }
  183. }
  185. //@扭曲文字
  186. public function distortionText(){
  187. $this->distortionImage=imagecreatetruecolor($this->width,$this->height);
  188. imagefill($this->distortionImage,0,0,$this->randBgColor);
  189. for($x=0;$x<$this->width;$x++){
  190. for($y=0;$y<$this->height;$y++){
  191. $rgbColor=imagecolorat($this->image,$x,$y);
  192. imagesetpixel($this->distortionImage,(int)($x+sin($y/$this->height*2*M_PI-M_PI*0.5)*3),$y,$rgbColor);
  193. }
  194. }
  195. $this->image=$this->distortionImage;
  196. }
  198. //@生成验证码图片
  199. public function createImage(){
  200. $this->initImage(); //创建基本图片
  201. $this->createText(); //输出验证码字符
  202. if($this->distortion){$this->distortionText();} //扭曲文字
  203. $this->createNoisePoint(); //产生干扰点
  204. $this->createNoiseLine(); //产生干扰线
  205. if($this->showBorder){imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$this->randFontColor);} //添加边框
  206. imagepng($this->image);
  207. imagedestroy($this->image);
  208. if($this->distortion){imagedestroy($this->$distortionImage);}
  209. return $this->textContent;
  210. }
  211. }
  212. ?>
  213. code.php//new 一个对象，负责图片的创建以及验证码文本写入session
  214. session_start();
  215. header("Content-type:image/png");
  216. include('checkCode.class.php');
  217. $captcha5=new Captcha();
  219. //@设置验证码宽度
  220. //$captcha5->setWidth(200);
  222. //@设置验证码高度
  223. //$captcha5->setHeight(50);
  225. //@设置字符个数
  226. $captcha5->setTextNumber(4);
  228. //@设置字符颜色
  229. //$captcha5->setFontColor('#ffffff');
  231. //@设置字号大小
  232. //$captcha5->setFontSize(25);
  234. //@设置字体
  235. $captcha5->setFontFamily('c:\\windows\\fonts\\comic.TTF');
  237. //@设置语言
  238. $captcha5->setTextLang('en');
  240. //@设置背景颜色
  241. //$captcha5->setBgColor('#000000');
  243. //@设置干扰点数量
  244. //$captcha5->setNoisePoint(600);
  246. //@设置干扰线数量
  247. //$captcha5->setNoiseLine(10);
  249. //@设置是否扭曲
  250. //$captcha5->setDistortion(true);
  252. //@设置是否显示边框
  253. $captcha5->setShowBorder(true);
  255. //输出验证码
  256. $code=$captcha5->createImage();
  257. $_SESSION['captchaCode']['content']=$code;
  258. //$_SESSION['captchaCode']['time']=microtime();
  259. ?>

login.php//登陆页面，调用生成的验证码图片

  4. 验证码：
  12. https://img.gxlcms.com//Uploads-s/new/2019-09-22-201922/ww12.jbxue.com

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