In PHP, how do I filter objects with strong typing?

In PHP, you can filter objects using strong typing and type hints. This allows you to ensure that the passed arguments are of a certain class type, which can be very useful for filtering collections of objects.

keywords: PHP, strong typing, type hinting, object filtering, programming

description: This example demonstrates how to filter an array of objects in PHP using strong typing with type hints in a method.


        <?php
        class Animal {
            public string $name;

            public function __construct(string $name) {
                $this->name = $name;
            }
        }

        class Dog extends Animal {
            public function bark() {
                return "{$this->name} says woof!";
            }
        }

        class Cat extends Animal {
            public function meow() {
                return "{$this->name} says meow!";
            }
        }

        function filterDogs(array $animals): array {
            return array_filter($animals, fn($animal) => $animal instanceof Dog);
        }

        // Usage example
        $animals = [
            new Dog("Buddy"),
            new Cat("Whiskers"),
            new Dog("Max"),
            new Cat("Mittens")
        ];

        $dogs = filterDogs($animals);
        print_r($dogs);
        ?>

In PHP, how do I filter objects with strong typing?

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In PHP, how do I filter objects with strong typing?

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