OOP PHP

type-hinting.php

<?php
//Class where we are going to implement typehinting
class Typehinting_Test
{
    //Implementation Type Hinting in PHP
    //Forcing to pass argument as object of class Test1
    public function type_hint_method(Test1 $parameter)
    {
        $parameter->test_method();
    }
}

//Below is class
class Test1
{
    public function __construct()
    {
    //Do Nothing
    }

    //Method to call in the type hinting class
    public function test_method()
    {
        echo 'Type Hinting in PHP works';
    }
}

$th_test = new Typehinting_Test();
//$th_test->type_hint_method(1221) //Will give fatal error: Catchable fatal error: Argument 1 passed to Typehinting_Test::type_hint_method() must be an instance of Test1, integer given

$t1 = new Test1();
$th_test->type_hint_method($t1); // Print Type Hinting in PHP works

?>