PHP | ReflectionClass isSubclassOf() Function

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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 
  
// Initialising a user-defined superclass Company 
class Company { 
    public function zambiatek() {} 
} 
  
// 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 
  
// 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); 
?> 