register_shutdown_function() and die()

die, php, smarty

Solution

Kind of... but you won't necessarily like how it has to be done.

Since there is no hook that allows you to check if `die` was called, you will have to somehow fake it. Assuming that you cannot touch all calls to `die`, that leaves only one option: set some state that signifies "`die` was called" by default, and remove that state only at the very end of your script, when you know that you are going to exit without `die` having been called earlier.

"Set some state" sounds suspiciously like global variables and that should be a last resort, so let's use a constant for state:

register_shutdown_function('shutdown');
if (condition) die('Calling die()');

// since we reached this point, die was not called
define('DIE_NOT_CALLED', true);

function shutdown()
{
    if (!defined('DIE_NOT_CALLED'))
    {
        // Script was canceled by die()
    }
}

See it in action.

Problem

Can I somehow check, if my script was canceled by `die()` in `register_shutdown_function()`? Something like this: ``` register_shutdown_function('shutdown'); die('Calling die()'); function shutdown() { if (???) { // Script was canceled by die() } } ``` NOTE: On my website, I use Smarty. So maybe check, if `$smarty->display()` was called or something like that?

Original source