PHP | ReflectionClass isInternal() Function

Last Updated : 17 Dec, 2019
The ReflectionClass::isInternal() function is an inbuilt function in PHP which is used to check if class is defined internally by an extension, or the core. Syntax: 
bool ReflectionClass::isInternal( void )
Parameters: This function does not accept any parameters. Return Value: This function returns TRUE if the class is defined internally by an extension, otherwise FALSE. Below programs illustrate the ReflectionClass::isInternal() function in PHP: Program 1: php 
<?php

// Initializing a user-defined class Departments
class Departments {
    public function CSE() {}
}

// Using ReflectionClass() over the
// user-defined class Departments
$class = new ReflectionClass('Departments');

// Calling the isInternal() function
$instance = $class->isInternal();

// Getting the value true or false
var_dump($instance);
?>
Output: 
bool(false)
Program 2: php 
<?php

// Using ReflectionClass internally
$InternalClass = new ReflectionClass('ReflectionClass');

// Calling the isInternal() function and
// getting the value true or false
var_dump($InternalClass->isInternal());
?>
Output: 
bool(true)
Reference: https://www.php.net/manual/en/reflectionclass.isinternal.php
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