Generate random verification? Solution

Did I download a piece of code that generates a random verification code online? I can't show pictures, but my colleagues can. the code is correct. why? What configurations do I need to add? ------ Solution ---------------------- find & nbsp; extensionphp_gd2.dll & nbsp; in the php configuration file, remove the previous; number, and then restart to generate random verification?
I downloaded a random verification code on the Internet, and the image cannot be displayed.
But my colleagues can show that the code is correct. why?
What configurations do I need to add?
------ Solution ----------------------
Find extension = php_gd2.dll in the php configuration file and remove the previous; no., and then restart it.