PHP | ReflectionClass implementsInterface() Function

The ReflectionClass::implementsInterface() function is an inbuilt function in PHP which is used to check the specified interface is present or not.

Syntax:

bool ReflectionClass::implementsInterface( string $interface )

Parameters: This function accepts a single parameter $interface which holds the specified interface which are being checked.

Return Value: This function returns true on success or false on failure.

Below programs illustrate the ReflectionClass::implementsInterface() function in PHP:

Program 1:

<?php

// Defining some interfaces
interface Colleges { }
interface Departments { }
interface Students { }
interface Companies { }

// Initialising a class of Interfaces
class Interfaces implements Colleges,
        Departments, Students, Companies { }

// Using ReflectionClass over the class Interfaces
$A = new ReflectionClass("Interfaces");

// Calling the implementsInterface() function
// over the Interface 'Colleges'
$B = $A->implementsInterface('Colleges');

// Getting the value true or false
var_dump($B);
?>

Output:

bool(true)

Program 2:

<?php

// Defining a SuperClass interface Company
interface Company {
    public function GFG();
}

// Defining a different interface Company1
interface Company1 {
    public function GeeksforGeeks();
}

// Defining a subclass Departments
class Departments implements Company {
    public function GFG() {}
}

// Using ReflectionClass() over the
// subclass Departments
$reflect = new ReflectionClass('Departments');

// Calling implementsInterface() function
$A = $reflect->implementsInterface('Company1');

// Getting the value either true or false
var_dump($A);

?>

Output:

bool(false)

Reference: https://www.php.net/manual/en/reflectionclass.implementsinterface.php