What is the order of function execution in PHP exception handling?

PHP exception handling function execution sequence is: exception object constructor set_exception_handler() calls shutdown function exit() calls

Function execution in PHP exception handling Sequence

In PHP, when an exception occurs, PHP will execute the following functions in the following order:

1. Exception object constructor: Exception object will be created and passed to the constructor.
2. set_exception_handler() Call: This function will be called if an exception handler has been set.
3. shutdown function: All registered functions and variables will be destroyed.
4. exit() call: The script will exit with status code 1.

Practical case:

<?php
try {
    throw new Exception('My Exception');
} catch (Exception $e) {
    echo 'Caught exception: ' . $e->getMessage() . PHP_EOL;
} finally {
    echo 'Finally block executed' . PHP_EOL;
}

Execution sequence:

1. Create an exception object and pass it to Exception Constructor.
2. Call set_exception_handler() handler, skip this step because it is not set here.
3. All registered functions and variables will be destroyed.
4. The script will exit with status code 1.

Output:

Caught exception: My Exception
Finally block executed

It is worth noting that even if the exception is thrown in the finally block, it will not be caught .

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