PHP | ReflectionParameter isOptional() Function
Last Updated :
23 Dec, 2019
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The ReflectionParameter::isOptional() function is an inbuilt function in PHP which is used to return TRUE if the specified parameter is optional, otherwise FALSE.
Syntax:
php
php
bool ReflectionParameter::isOptional ( void )Parameters: This function does not accept any parameters. Return Value: This function returns TRUE if the specified parameter is optional, otherwise FALSE. Below programs illustrate the ReflectionParameter::isOptional() 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 isOptional() function
$B = $A->isOptional();
// Getting TRUE if the specified parameter
// is optional, otherwise FALSE.
var_dump($B);
?>
Output:
Program 2:
bool(true)
<?php
// Initializing some user-defined classes
class Department1
{
function HR( $Full_Name){}
}
class Department2
{
function Coding( $Parameter2, $Par3 = 'Parameter3'){}
}
class Department3
{
function Marketing( $Parameter4, $Parameter5){}
}
// Using the ReflectionParameter over the above classes
$A = new ReflectionParameter(['Department1', 'HR'], 0);
$B = new ReflectionParameter(['Department2', 'Coding'], 1);
$C = new ReflectionParameter(['Department3', 'Marketing'], 1);
// Calling the isOptional() function and
// getting TRUE if the specified parameter
// is optional, otherwise FALSE.
var_dump($A->isOptional());
var_dump($B->isOptional());
var_dump($C->isOptional());
?>
Output:
Reference: https://www.php.net/manual/en/reflectionparameter.isoptional.php
bool(false) bool(true) bool(false)
