PHP create_function() Function

PHP | call_user_func() Function

Last Updated : 25 Jun, 2018

The call_user_func() is an inbuilt function in PHP which is used to call the callback given by the first parameter and passes the remaining parameters as argument. It is used to call the user-defined functions.

Syntax:

mixed call_user_func ( $function_name[, mixed $value1[, mixed $... ]])

Here, mixed indicates that a parameter may accept multiple types.
Parameter: The call_user_func() function accepts two types of parameters as mentioned above and described below:

$function_name: It is the name of function call in the list of defined function. It is a string type parameter.
$value: It is mixed value. One or more parameters to be passed to the function.

Return Value: This function returns the value returned by the callback function.

Below programs illustrate the call_user_func() function in PHP:

Program 1: Call the function

<?php 
function GFG($value) 
{ 
    echo "This is $value site.\n"; 
} 
  
call_user_func('GFG', "GeeksforGeeks"); 
call_user_func('GFG', "Content"); 
  
?> 

Output:

This is GeeksforGeeks site.
This is Content site.

Program 2: call_user_func() using namespace name

<?php 
  
namespace Geeks; 
  
class GFG { 
    static public function demo() { 
        print "GeeksForGeeks\n"; 
    } 
} 
  
call_user_func(__NAMESPACE__ .'\GFG::demo');  
  
// Another way of declaration 
call_user_func(array(__NAMESPACE__ .'\GFG', 'demo'));  
  
?> 

Output:

GeeksForGeeks
GeeksForGeeks

Program 3: Using a class method with call_user_func()

<?php 
  
class GFG { 
    static function show() 
    { 
        echo "Geeks\n"; 
    } 
} 
  
$classname = "GFG"; 
call_user_func($classname .'::show'); 
  
// Another way to use object 
$obj = new GFG(); 
call_user_func(array($obj, 'show')); 
  
?> 

Output:

Geeks
Geeks

Program 4: Using lambda function with call_user_func()

<?php 
call_user_func(function($arg) { print "$arg\n"; }, 'GeeksforGeeks'); 
?> 

Output:

GeeksforGeeks

References: http://php.net/manual/en/function.call-user-func.php

PHP create_function() Function

M

Mithun Kumar

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