gistfile1.php

<?php

// set an exception handler so that we can render nice errors when bad thigns
// happen instead of spaming the user with garbage.

set_exception_handler(function(){
	echo 'somebody derped in the waterhole';

	// your framework logging utility to log this
	// ...
	// goes here.
});

// a super simplified theme engine.

class ThemeEngine {
	protected $HasRendered = false;

	public function __destruct() {
		if(!$this->HasRendered) $this->Render();
	}

	public function Render() {
		throw new Exception('Theme Not Found!');
	}
}

// my framework manages a copy of the theme engine for me, so i do not need to
// create it nor destroy it. by design when the script ended i wanted it to be
// smart and say "oh end of script? i haven't rendered! i'll do it now!"

$theme = new ThemeEngine;

// so lets pretend this instance above was actually created by the system and
// we do not have to explicitly interact with it except when we want. now lets
// let the script end... the exact same things are going to happen, the object
// is going to destruct and attempt to render a page, but not be able to find
// the theme.

/*
Fatal error: Uncaught exception 'Exception' with message 'Theme Not Found!'
*/