post_max_exec_time_handler.php

<?php

function max_execution_time_handler() {
	set_time_limit(0);
	$err = error_get_last();
	if ($err != null && preg_match('@^Maximum execution time@', $err['message'])) {
		ob_start();
			debug_print_backtrace();
		$backtrace = ob_get_clean();
		error_log($backtrace);
	}
}

register_shutdown_function('max_execution_time_handler');


ini_set('max_execution_time', 1);
sleep(3);

echo 'here';