PHP | ReflectionClass getExtensionName() Function

The ReflectionClass::getExtensionName() function is an inbuilt function in PHP which is used to return the name of the extension which define the class or false for user-defined classes.
Syntax:

string ReflectionClass::getExtensionName( void )

Parameters: This function does not accept any parameters.
Return Value: This function returns the name of the extension which define the class or false for user-defined classes.
Below programs illustrate the ReflectionClass::getExtensionName() function in PHP:
Program 1:

php

<?php

// Defining a user-defined class named as Departments
class Departments {
    static $Dept1 = 'CSE';
    private static $Dept2 = 'ECE';
    public static $Dept3 = 'EE';
}

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

// Calling getExtensionName() functions
$A = $ReflectionClass->getExtensionName();

// Getting the name of the extension
var_dump($A);
?>

Output:

bool(false)

Program 2:

php

<?php

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

// Calling getExtensionName() functions
$A = $ReflectionClass->getExtensionName();

// Getting the name of the extension
var_dump($A);
?>

Output:

string(10) "Reflection"

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