The ReflectionClass::getExtension() function is an inbuilt function in PHP which is used to return the ReflectionExtension object which represents the extension for the defined class, or NULL for the user-defined classes.
Syntax:
ReflectionExtension ReflectionClass::getExtension( void )
Parameters: This function does not accept any parameters.
Return Value: This function returns a ReflectionExtension object which represents the extension for the defined class, or NULL for the user-defined classes.
Below programs illustrate the ReflectionClass::getExtension() function in PHP:
Program 1:
<?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 getExtension() functions $A = $ReflectionClass->getExtension();    // Getting the ReflectionExtension object var_dump($A); ?> |
Output:
NULL
Program 2:
<?php    // Using ReflectionClass $ReflectionClass = new ReflectionClass('ReflectionClass');    // Calling getExtension() functions $A = $ReflectionClass->getExtension();    // Getting the ReflectionExtension object var_dump($A); ?> |
Output:
object(ReflectionExtension)#2 (1) {
["name"]=>
string(10) "Reflection"
}
Reference: https://www.php.net/manual/en/reflectionclass.getextension.php
