PHP | ReflectionParameter getDeclaringFunction() Function

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The ReflectionParameter::getDeclaringFunction() function is an inbuilt function in PHP which is used to return the declaring function.

Syntax:

ReflectionFunctionAbstract ReflectionParameter::getDeclaringFunction ( void )

Parameters: This function does not accept any parameter.

Return Value: This function returns the declaring function.

Below programs illustrate the ReflectionParameter::getDeclaringFunction() function in PHP:
Program 1:

<?php 
  
// Initializing a user-defined class Company1 
class Company1 
{ 
    public function GFG($Parameter){} 
} 
  
// Initializing a subclass Company2 
class Company2 extends Company1 
{ 
} 
  
// Using the ReflectionParameter over the above class 
$A = new ReflectionParameter(['Company2', 'GFG'], 0);  
  
// Calling the getDeclaringFunction() function 
$B = $A->getDeclaringFunction(); 
  
// Getting the specified declaring function 
var_dump($B); 
?> 

Output:

object(ReflectionMethod)#2 (2) {
  ["name"]=>
  string(3) "GFG"
  ["class"]=>
  string(8) "Company1"
}

Program 2:

<?php 
  
// Initializing some user-defined classes 
class Department1 
{ 
    public function HR($Parameter1){} 
} 
class Department2 
{ 
    public function Coding($Parameter2, $Parameter3){} 
} 
class Department3 
{ 
    public function Marketing($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 getDeclaringFunction() function and 
// getting the specified declaring functions 
var_dump($A->getDeclaringFunction()); 
var_dump($B->getDeclaringFunction()); 
var_dump($C->getDeclaringFunction()); 
?> 

Output:

object(ReflectionMethod)#4 (2) {
  ["name"]=>
  string(2) "HR"
  ["class"]=>
  string(11) "Department1"
}
object(ReflectionMethod)#4 (2) {
  ["name"]=>
  string(6) "Coding"
  ["class"]=>
  string(11) "Department2"
}
object(ReflectionMethod)#4 (2) {
  ["name"]=>
  string(9) "Marketing"
  ["class"]=>
  string(11) "Department3"
}

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

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