Programming languages that are popular by businesses · What’s the difference between the include () and require () functions? They both include a specific file but on require the process exits with a fatal error if the file can’t be included, while include statement may still pass and jump to the next step in the execution. · How can we get the IP address of the client? This question might show you how playful and creative the candidate is because there are many options. $_SERVER["REMOTE_ADDR"]; is the easiest solution · What’s the difference between unset() and unlink() unset() sets a variable to “ undefined ” while unlink() deletes a file we pass to it from the file system. · What are the main error types in PHP and how...