PHP | ReflectionClass getReflectionConstants() Function

The ReflectionClass::getReflectionConstants() function is an inbuilt function in PHP which is used to return an array of ReflectionClassConstant objects.

Syntax:

array ReflectionClass::getReflectionConstants( void )

Parameters: This function does not accept any parameters.

Return Value: This function returns an array of ReflectionClassConstant objects.

Below programs illustrate the ReflectionClass::getReflectionConstants() function in PHP:
Program 1:

<?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 getReflectionConstants() function
$a = $A->getReflectionConstants();

// Getting an array of ReflectionClassConstant objects.
print_r($a);
?>

Output:

Array
(
    [0] => ReflectionClassConstant Object
        (
            [name] => First
            [class] => Company
        )

    [1] => ReflectionClassConstant Object
        (
            [name] => Second
            [class] => Company
        )

)

Program 2:

<?php

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

// Calling the getReflectionConstants() function
$a = $A->getReflectionConstants();

// Getting an array of ReflectionClassConstant objects.
print_r($a);
?>

Output:

Array
(
    [0] => ReflectionClassConstant Object
        (
            [name] => IS_IMPLICIT_ABSTRACT
            [class] => ReflectionClass
        )

    [1] => ReflectionClassConstant Object
        (
            [name] => IS_EXPLICIT_ABSTRACT
            [class] => ReflectionClass
        )

    [2] => ReflectionClassConstant Object
        (
            [name] => IS_FINAL
            [class] => ReflectionClass
        )

)

Reference: https://secure.php.net/manual/en/reflectionclass.getreflectionconstants.php