<?php

class Foo
{
    const CHANGED = 1;
    const IS_NEW = 2;
    public $value = 1;
}

$o1 = new Foo();
$o2 = new Foo();
$o3 = new Foo();

// initial storage states, all unchanged

$storage = new SplObjectStorage();
$storage->attach($o1);
$storage->attach($o2);
$storage->attach($o3);

// change happens to one of the Foo instances

$o2->value = 5;
if (true === $storage->contains($o2)) {
    $storage[$o2] = Foo::CHANGED;
} 

// A new Foo instance appears

$o4 = new Foo();
$o4->value = 8;
if (false === $storage->contains($o4)) { 
    $storage->attach($o4, Foo::IS_NEW);
} 

// At the end, handle all the states of the objects

foreach ($storage as $obj) {
    switch ($storage[$obj]) {
        case Foo::CHANGED:
            echo 'Update Foo, value: ' . $obj->value;
            break;
        case Foo::IS_NEW:
            echo 'Save new Foo, value: ' . $obj->value;
            break;
        default:
            echo 'Unchanged: ' . $obj->value;
    }
    echo PHP_EOL;
}

Unchanged: 1
Update Foo, value: 5
Unchanged: 1
Save new Foo, value: 8

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PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8