How can type hinting be implemented in PHP classes to enforce object type validation?

To implement type hinting in PHP classes to enforce object type validation, you can use type declarations in method parameters and return types. This allows you to specify the expected class or interface that an object should be, ensuring that only objects of the specified type can be passed into the method or returned from it. 

class MyClass {
    public function myMethod(OtherClass $obj): void {
        // Method implementation
    }
}

class OtherClass {
    // Class definition
}

$obj1 = new OtherClass();
$obj2 = new stdClass();

$instance = new MyClass();
$instance->myMethod($obj1); // This will work
$instance->myMethod($obj2); // This will throw a TypeError

Keywords

type hinting PHP classes object type validation implementation enforce

Related Questions