PHP | ReflectionParameter isDefaultValueAvailable() Function

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The ReflectionParameter::isDefaultValueAvailable() function is an inbuilt function in PHP which is used to return TRUE if a default value is available, otherwise FALSE

Syntax:

bool ReflectionParameter::isDefaultValueAvailable ( void )

Parameters: This function does not accept any parameters.

Return Value: This function returns TRUE if a default value is available, otherwise FALSE.

Below programs illustrate the ReflectionParameter::isDefaultValueAvailable() 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 isDefaultValueAvailable() function 
$B = $A->isDefaultValueAvailable(); 
   
// Getting TRUE if a default value is available, 
// otherwise FALSE 
var_dump($B); 
?> 

Output:

bool(true)

Program 2:

<?php 
   
// Initializing some user-defined classes 
class Department1 
{ 
    function HR( $Full_Name = 'Human Resource'){} 
} 
class Department2 
{ 
    function Coding( $Parameter2, $Parameter3){} 
} 
class Department3 
{ 
    function Marketing( $Parameter4, $Parameter5, $Parameter6){} 
} 
   
// Using the ReflectionParameter over the above classes 
$A = new ReflectionParameter(['Department1', 'HR'], 0); 
$B = new ReflectionParameter(['Department2', 'Coding'], 1); 
$C = new ReflectionParameter(['Department3', 'Marketing'], 2); 
   
// Calling the isDefaultValueAvailable() function and  
// getting TRUE if a default value is available,  
// otherwise FALSE 
var_dump($A->isDefaultValueAvailable()); 
var_dump($B->isDefaultValueAvailable()); 
var_dump($C->isDefaultValueAvailable()); 
?> 