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PHP | ReflectionClass getConstant() Function

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The ReflectionClass::getConstant() function is an inbuilt function in PHP which is used to return the value of the defined constant. Syntax:
mixed ReflectionClass::getConstant( string $name )
Parameters: This function accepts a parameter Name which is the name of the defined constant. Return Value: This function returns the value of the defined constant. Below programs illustrate the ReflectionClass::getConstant() function in PHP: Program 1:
<?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);
?>

                    
Output:
CSE
Program 2:
<?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'));
?>

                    
Output:
GeeksforGeeks
GFG
gfg
Reference: https://www.php.net/manual/en/reflectionclass.getconstant.php

Last Updated : 30 Nov, 2019
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