Multiple Objects

The same class can create separate objects with separate values.

multiple_objects.php

<?php
class PackageBox
{
    public function __construct(public int $weight)
    {
    }
}

$extra = ;
$firstWeight = (new PackageBox(3))->weight;
$secondWeight = (new PackageBox(4 + $extra))->weight;
$totalWeight = $firstWeight + $secondWeight;

echo "first=" . $firstWeight . "\n";
echo "second=" . $secondWeight . "\n";
echo "total=" . $totalWeight . "\n";

<?php
class PackageBox
{
    public function __construct(public int $weight)
    {
    }
}

$extra = ;
$firstWeight = (new PackageBox(3))->weight;
$secondWeight = (new PackageBox(4 + $extra))->weight;
$totalWeight = $firstWeight + $secondWeight;

echo "first=" . $firstWeight . "\n";
echo "second=" . $secondWeight . "\n";
echo "total=" . $totalWeight . "\n";

<?php
class PackageBox
{
    public function __construct(public int $weight)
    {
    }
}

$extra = ;
$firstWeight = (new PackageBox(3))->weight;
$secondWeight = (new PackageBox(4 + $extra))->weight;
$totalWeight = $firstWeight + $secondWeight;

echo "first=" . $firstWeight . "\n";
echo "second=" . $secondWeight . "\n";
echo "total=" . $totalWeight . "\n";

separate instances Two objects made from one class can produce different scalar results.