PHP | ReflectionClass implementsInterface() Function

Last Updated : 11 Dec, 2019
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 
<?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 
<?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
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