PHP | ReflectionParameter isPassedByReference() Function

The ReflectionParameter::isPassedByReference() function is an inbuilt function in PHP which is used to return TRUE if the specified parameter is passed by reference, otherwise FALSE. Syntax:

 bool ReflectionParameter::isPassedByReference ( void )

Parameters: This function does not accept any parameters. Return Value: This function returns TRUE if the specified parameter is passed by reference, otherwise FALSE. Below programs illustrate the ReflectionParameter::isPassedByReference() function in PHP: Program 1:

php

<?php
 
// Initializing a user-defined class Company1
class Company1
{
    public function GFG(array &$Parameter){}
}
  
// Initializing a subclass Company2
class Company2 extends Company1
{
}
  
// Using the ReflectionParameter over the above class
$A = new ReflectionParameter(['Company2', 'GFG'], 0); 
  
// Calling the isPassedByReference() function
$B = $A->isPassedByReference();
  
// Getting TRUE if the specified parameter 
// is passed by reference, otherwise FALSE.
var_dump($B);
?>

Output:

bool(true)

Program 2:

php

<?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'], 0);
  
// Calling the isPassedByReference() function and 
// getting TRUE if the specified parameter
// is passed by reference, otherwise FALSE.
var_dump($A->isPassedByReference());
var_dump($B->isPassedByReference());
var_dump($C->isPassedByReference());
?>

Output:

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

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