<?php class class_a { public function __construct( private readonly string $foo, ) {} } class class_b extends class_a { public function __construct( string $foo, public readonly string $bar, ) { parent::__construct($foo); // no really needed here. } } class class_c { public function __construct( private readonly string $foo, public readonly string $bar, ) { } } $b = new class_b('foo_value', 'bar_value'); $c = new class_c('foo_value', 'bar_value'); var_dump(serialize($b), serialize($c));
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