PHP | ReflectionParameter isOptional() Function

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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:

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 = zambiatek){} 
} 
    
// 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:

bool(true)

Program 2:

<?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:

bool(false)
bool(true)
bool(false)

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

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