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Example of php generating verification code

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Release： 2016-07-25 09:04:24
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  6. index.html
  13. 验证码
  14. 看不清？换一个
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2、verifycode.php

  2. /*
  3. 图片验证码 Powered By KASON test http://bbs.it-home.org */
  4. session_start();
  5. $num=4;//验证码个数
  6. $width=80;//验证码宽度
  7. $height=20;//验证码高度
  8. $code=' ';
  9. for($i=0;$i<$num;$i++)//生成验证码
  10. {
  11. switch(rand(0,2))
  12. {
  13. case 0:$code[$i]=chr(rand(48,57));break;//数字
  14. case 1:$code[$i]=chr(rand(65,90));break;//大写字母
  15. case 2:$code[$i]=chr(rand(97,122));break;//小写字母
  16. }
  17. }
  18. $_SESSION["VerifyCode"]=$code;
  19. $image=imagecreate($width,$height);
  20. imagecolorallocate($image,255,255,255);
  21. for($i=0;$i<80;$i++)//生成干扰像素
  22. {
  23. $dis_color=imagecolorallocate($image,rand(0,2555),rand(0,255),rand(0,255));
  24. imagesetpixel($image,rand(1,$width),rand(1,$height),$dis_color);
  25. }
  26. for($i=0;$i<$num;$i++)//打印字符到图像
  27. {
  28. $char_color=imagecolorallocate($image,rand(0,2555),rand(0,255),rand(0,255));
  29. imagechar($image,60,($width/$num)*$i,rand(0,5),$code[$i],$char_color);
  30. }
  31. header("Content-type:image/png");
  32. imagepng($image);//输出图像到浏览器
  33. imagedestroy($image);//释放资源
  34. ?>
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3、checkcode.php

  3. ini_set('display_errors', 'Off');
  4. session_start();
  5. if((strtoupper($_POST["code"])) == strtoupper(($_SESSION["VerifyCode"]))){
  6. print("验证码正确,");
  7. }else{
  8. print("验证码错误,");
  9. }
  10. echo "提交的验证码:".strtoupper($_POST["code"]).",正确的验证码：".strtoupper($_SESSION["VerifyCode"]);
  11. ?>
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Related labels：
php生成验证码的例子
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