What is the difference between die() and exit() in PHP?

In PHP, die and exit are functions that stop the execution of a script. They are similar, but there are a few differences between them:

1. die is an alias of the exit function, so they are interchangeable.
2. exit can accept an exit status code as an argument, which can be used to indicate the success or failure of the script. The die function does not support this.
3. exit can also accept an optional message as an argument, which will be printed to the output before the script terminates. The die function also supports this.

Here’s an example of how you can use both functions:

exit(0);  // Exit with status code 0 (success)
exit(1);  // Exit with status code 1 (failure)
exit('An error occurred');  // Exit with status code 0 and print a message

die();  // Same as exit
die(1);  // Invalid, as die does not support status codes
die('An error occurred');  // Same as exit('An error occurred')

In general, you can use either die or exit to stop the execution of a script, depending on your preference and whether you need to specify an exit status code or message.