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

In PHP, you can validate objects with strong typing by using type declarations for class properties and method parameters. This ensures that only the expected types are assigned and passed around, allowing for safer and cleaner code. Below is an example of how to implement strong typing in PHP.


        <?php
        
        class User {
            private string $name;
            private int $age;

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

            public function getName(): string {
                return $this->name;
            }

            public function getAge(): int {
                return $this->age;
            }

            public function setAge(int $age): void {
                if ($age < 0) {
                    throw new InvalidArgumentException("Age cannot be negative");
                }
                $this->age = $age;
            }
        }

        // Example of usage
        try {
            $user = new User("John Doe", 30);
            echo $user->getName() . " is " . $user->getAge() . " years old.";
        } catch (InvalidArgumentException $e) {
            echo $e->getMessage();
        }
        
        ?>

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

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

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