PHP | ReflectionClass isSubclassOf() Function

Last Updated : 5 Dec, 2019
The ReflectionClass::isSubclassOf() function is an inbuilt function in PHP which is used to check if any subclass is available or not. Syntax: 
bool ReflectionClass::isSubclassOf( $class )
Parameters: This function accepts a single parameter class which is the class name being checked against. Return Value: This function returns TRUE if the subclass is available, otherwise FALSE. Below programs illustrate the ReflectionClass::isSubclassOf() function in PHP: Program 1: php 
<?php

// Initialising a user-defined superclass Company
class Company {
    public function GeeksforGeeks() {}
}

// Creating a subclass Departments 
class Departments extends Company {
    public function HR_Department() {}
}

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

// Calling the isSubclassOf() function
$Result = $subclass->isSubclassOf('Company');

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

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

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

// Calling the isSubclassOf() function
$Result = $subclass->isSubclassOf('Departments');

// Getting the value true or false
var_dump($Result);
?>
Output: 
bool(false)
Reference: https://www.php.net/manual/en/reflectionclass.issubclassof.php
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