PHP | ReflectionClass getConstant() Function

<?php

// Declaring a class named as Department
class Department {
    
    // Defining a constant
    const First = "CSE";
    
}

// Using the ReflectionClass() function 
// over the Department class
$A = new ReflectionClass('Department');

// Calling the getConstant() function over
// First constant
$a = $A->getConstant('First');

// Getting the value of the defined constant
print_r($a);
?>

<?php
  
// Declaring a class named as Company
class Company {
      
    // Defining a constant
    const First = "GeeksforGeeks";
    const Second = "GFG";
    const Third = "gfg";
      
}
  
// Using the ReflectionClass() function 
// over the Company class
$A = new ReflectionClass('Company');
  
// Calling the getConstant() function over
// the defined constants and
// getting the value of the defined constants
print_r($A->getConstant('First'));
echo("\n");
print_r($A->getConstant('Second'));
echo("\n");
print_r($A->getConstant('Third'));
?>