The ReflectionClass::getConstants() function is an inbuilt function in PHP which is used to return an array of the specified constant names.
Syntax:
array ReflectionClass::getConstants( void )
Parameters: This function does not accept any parameter.
Return Value: This function returns an array of the specified constant names.
Below programs illustrate the ReflectionClass::getConstants() function in PHP:
Program 1:
<?php   // Declaring a class named as Company class Company {           // Defining some constants     const First = "neveropen";     const Second = "GFG"; }   // Using the ReflectionClass() function // over the Company class $A = new ReflectionClass('Company');   // Calling the getConstants() function $a = $A->getConstants();   // Getting an array of the constants print_r($a); ?> |
Output:
Array
(
[First] => neveropen
[Second] => GFG
)
Program 2:
<?php   // Declaring a class named as Departments class Departments {           // Defining some constants     const First = "CSE";     const Second = "ECE";     const Third = "EE";     const Fourth = "Mechanical"; }   // Using the ReflectionClass() function // over the Departments class $A = new ReflectionClass('Departments');   // Calling the getConstants() function $a = $A->getConstants();   // Getting an array of the constants print_r($a); ?> |
Output:
Array
(
[First] => CSE
[Second] => ECE
[Third] => EE
[Fourth] => Mechanical
)
Reference: https://www.php.net/manual/en/reflectionclass.getconstants.php
