When should I use require_once vs require ?

Here is my answer to your PHP interview question:

When to use require_once vs require

The require_once and require statements in PHP are used to include external files into a script. The main difference between them is how they handle duplicate inclusions.

require_once

• require_once will only include the specified file once, even if it is called multiple times in the script.
• If the file is included again, PHP will ignore the second require_once statement.
• This helps avoid issues with redefined functions, variables, or classes.
• Use require_once when you want to ensure a file is only included once, such as for configuration files, class definitions, or utility functions that should only be loaded once.

require

• require will include the sp...