<?php
class Foo
{
    public function __construct(private string $name = 'default') {}
    public function __serialize(): array { return ['name' => $this->name]; }
    public function getName(): string { return $this->name; }

    // __unserialize() is intentionally undefined
    // public function __unserialize(array $data): void { $this->name = $data['name']; }
}

$original = new Foo('actual');
apcu_store('test_key', $original);
$restored = apcu_fetch('test_key');

echo "Original name: " . $original->getName() . PHP_EOL;
echo "Restored name: " . $restored->getName() . PHP_EOL;

$arr = (array) $restored;
echo PHP_EOL . "Cast to array (raw keys):" . PHP_EOL;
foreach ($arr as $key => $value) {
    echo "  " . json_encode($key) . " => " . json_encode($value) . PHP_EOL;
}