一个PHP验证码类代码分享(已封装成类)

代码如下:

1. <?php
   
2. session_start();
   
3. Header("Content-type: image/gif");
   
4. class SecurityCode
   
5. {
   
6. private $codes = '';
   
7. function __construct()
   
8. {
   
9. $code = '0-1-2-3-4-5-6-7-8-9-A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z';
   
10. $codeArray = explode('-',$code);
    
11. shuffle($codeArray);
    
12. $this->codes = implode('',array_slice($codeArray,0,4));
    
13. }
    
14. public function CreateImg()
    
15. {
    
16. $_SESSION['check_pic'] = $this->codes;
    
17. $img = imagecreate(70,25);
    
18. imagecolorallocate($img,222,222,222);
    
19. $testcolor1 = imagecolorallocate($img,255,0,0);
    
20. $testcolor2 = imagecolorallocate($img,51,51,51);
    
21. $testcolor3 = imagecolorallocate($img,0,0,255);
    
22. $testcolor4 = imagecolorallocate($img,255,0,255);
    
23. for ($i = 0; $i < 4; $i++)
    
24. {
    
25. imagestring($img,rand(5,6),8 + $i * 15,rand(2,8),$this->codes[$i],rand(1,4));
    
26. }
    
27. imagegif($img);
    
28. }
    
29. }
    
30. $code = new SecurityCode();
    
31. $code->CreateImg();
    
32. $code = NULL;
    
33. ?>

复制代码

封装成类之后，加入了构造函数，使用起来也方便些。你也可以继续完善下这个验证码类，比如加入析构函数，如何更节省内存等等。