PHP | ReflectionClass isInterface() Function

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

Syntax:

bool ReflectionClass::isInterface( void )

Parameters: This function does not accept any parameters.

Return Value: This function returns TRUE if the specified class is an interface, otherwise FALSE.

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

Program 1:

<?php 
  
// Initializing a user-defined interface Departments 
interface Departments { 
    public function CSE(); 
} 
  
// Using ReflectionClass() over the 
// user-defined interface Departments 
$class = new ReflectionClass('Departments'); 
  
// Calling the isInterface() function 
$instance = $class->isInterface(); 
  
// Getting the value true or false 
var_dump($instance); 
?> 

Output:

bool(true)

Program 2:

<?php 
  
// Initializing a user-defined class TestInterface 
Class TestInterface { 
} 
  
// Using ReflectionClass() over the 
// user-defined class TestInterface 
$class = new ReflectionClass('TestInterface'); 
  
// Calling the isInterface() function and 
// getting the value true or false 
var_dump($class->isInterface()); 
?> 

Output:

bool(false)

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

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