PHP | ReflectionParameter isPassedByReference() Function

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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 
   
// 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 
    
// 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

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