What is the difference between include() and require() functions in PHP?

In PHP, both include() and require() functions are used to include and evaluate the specified file in the current script. However, the main difference between the two functions is in how they handle errors:

• include(): If the specified file is not found, include() will emit a warning message and continue executing the script.
• require(): If the specified file is not found, require() will emit a fatal error and stop executing the script.

It's important to note that using include() is more common in situations where the inclusion of the file is not critical to the script's execution, while require() is preferred when the file being included is essential for the script to run properly.