What should I do if the PHP verification code image does not display the image?

The solution to the problem that the php verification code picture does not display the picture: first check whether php has the gd extension installed; then find the php.ini file in the php directory; finally change the file encoding method to utf-8 without DOM format. And just clear the cache before the header.

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PHP Image Verification Code Solution that cannot be displayed

Problem: Use php to implement image verification code, the page does not display

 
登录
 
 用户名  
 
 密码  
 
 
 验证码：  
 
  
 
 提交 
 
        

         Copy after login
        
       

Solution:

In the windows environment, check whether the gd extension is installed in php and it is enabled

Find the php.ini file in the php directory and look for the following statements Semicolon, remove the semicolon

Change the file encoding method to utf-8 DOM-less format

Clear the cache before the header

ob_clean(); header('Content-Type: image/png');

echo, print_r cannot appear before output, var_dump etc. print, comment or delete

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