PHP object Lifecycle.

scripts.php

<?php
echo 'script 1 start' . PHP_EOL;
class A12
{
    public $script = null;

    public function __construct ($script = 's1') {
        $this->script = $script;
    }

    public function __destruct () {
        echo 'destructing a12 - ' . $this->script . PHP_EOL;
    }
}

class B12
{
    public $script = null;

    public function __construct ($script = 's1') {
        $this->script = $script;
    }

    public function __destruct () {
        echo 'destructing b12 - ' . $this->script . PHP_EOL;
    }
}

function get_a12 ($s = 's1') {
    return new A12($s);
}

function get_b12 ($s = 's1') {
    return new B12($s);
}

$b12 = new B12('s1');

echo 'script 1 end' . PHP_EOL;

// script 1 ends

// script 2 starts
// <?php

// uncomment the following line when using multiple scripts
// include 'script1.php';

echo 'script 2 start' . PHP_EOL;

$a12 = new A12('s2');

echo 'script 2 end' . PHP_EOL;

// script 2 ends

// script 3 starts
// <?php

// uncomment the following line if using multiple scripts
// include 'script2.php';

echo 'script 3 start' . PHP_EOL;

get_a12('s3');
// comment any of the following adjucent lines, and uncomment the another one
get_b12('s3');
// $b2 = get_b12('s3');


echo 'script 3 end' . PHP_EOL;