Show PHP shutdown sequence

shutdown_sequence.php

<?php
    // Testing shutdown sequence
    // Adapted from https://evertpot.com/160/

    ob_start(
        function($buffer) {
            return $buffer . "output buffer flushed\n";
        }
    );

    $empty = function() {
        return true;
    };

    $close = function() {
        echo "session close\n";
        return true;
    };

    $write = function() {
        echo "session write\n";
        return true;
    };

    session_set_save_handler($empty, $close, $empty, $write, $empty, $empty);
    session_start();

    register_shutdown_function(
        function() {
            echo "register_shutdown_function\n";
        }
    );

    class MyClass {
        function __destruct() {
           echo "object destructor\n";
        }
    }

    $myObject = new MyClass;

#  Output (PHP 7):
# register_shutdown_function
# object destructor
# output buffer flushed
# session write
# session close