PHP | ReflectionParameter getDefaultValue() Function

The ReflectionParameter::getDefaultValue() function is an inbuilt function in PHP which is used to return the default value of the parameter for the specified user-defined function or method.

Syntax:

 mixed ReflectionParameter::getDefaultValue ( void )

Parameters: This function does not accept any parameters.

Return Value: This function returns the default value of the parameter for the specified user-defined function or method.

Below programs illustrate the ReflectionParameter::getDefaultValue() function in PHP:
Program 1:

<?php

// Initializing a user-defined class Company1
class Company1
{
    function GFG($Full_Name = 'GeeksforGeeks'){}
}

// Initializing a subclass Company2
class Company2 extends Company1
{
}

// Using the ReflectionParameter over the above class
$A = new ReflectionParameter(['Company2', 'GFG'], 0);

// Calling the getDefaultValue() function
$B = $A->getDefaultValue();

// Getting the default value of the parameter
var_dump($B);
?>

Output:

string(13) "GeeksforGeeks"

Program 2:

<?php

// Initializing some user-defined classes
class Department1
{
    function HR( $Full_Name = 'Human Resource'){}
}
class Department2
{
    function Coding( $Parameter2, $Par3 = 'Parameter3'){}
}
class Department3
{
    function Marketing( $Parameter4 = 'Digital Marketing', $Parameter5){}
}

// Using the ReflectionParameter over the above classes
$A = new ReflectionParameter(['Department1', 'HR'], 0);
$B = new ReflectionParameter(['Department2', 'Coding'], 1);
$C = new ReflectionParameter(['Department3', 'Marketing'], 0);

// Calling the getDefaultValue() function and
// getting the default value of the parameter
var_dump($A->getDefaultValue());
var_dump($B->getDefaultValue());
var_dump($C->getDefaultValue());
?>

Output:

string(14) "Human Resource"
string(10) "Parameter3"
string(17) "Digital Marketing"

Reference: https://www.php.net/manual/en/reflectionparameter.getdefaultvalue.php