<?php class Foo { private string $foo; private array $bar; public function __construct(string $foo, array $bar) { $this->foo = $foo; $this->bar = $bar; } public function square(): array { return array_map(fn($x) => $x * $x, $this->bar); } } $foo = new Foo('hello', [1, 2, 3, 4]); print_r($foo); print_r($foo->square());
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