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PHP | ReflectionClass getConstants() Function

Last Updated : 30 Nov, 2019
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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 
<?php

// Declaring a class named as Company
class Company {
    
    // Defining some constants
    const First = "GeeksforGeeks";
    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] => GeeksforGeeks
    [Second] => GFG
)
Program 2: php 
<?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

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PHP | ReflectionClass getConstant() Function

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