PYTHON call_user_func

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Python replacement for PHP's call_user_func [ edit | history ]
# if you already have a function object:
result = function(param1, ...) # duh
# if you have the name of the function:
result = eval(function_name)(param1, ...)

PHP call_user_func

PHP original manual for call_user_func [ show | php.net ]

call_user_func

(PHP 4, PHP 5)

call_user_funcCall a user function given by the first parameter

Description

mixed call_user_func ( callback $function [, mixed $parameter [, mixed $... ]] )

Call a user defined function given by the function parameter.

Parameters

function

The function to be called. Class methods may also be invoked statically using this function by passing array($classname, $methodname) to this parameter.

parameter

Zero or more parameters to be passed to the function.

Note: Note that the parameters for call_user_func() are not passed by reference.

<?php
function increment(&$var)
{
    
$var++;
}

$a 0;
call_user_func('increment'$a);
echo 
$a// 0

call_user_func_array('increment', array(&$a)); // You can use this instead
echo $a// 1
?>


Return Values

Returns the function result, or FALSE on error.

Examples

Example #1 call_user_func() example

<?php
function barber($type)
{
    echo 
"You wanted a $type haircut, no problem";
}
call_user_func('barber'"mushroom");
call_user_func('barber'"shave");
?>

Example #2 call_user_func() using namespace name

<?php

namespace Foobar;

class 
Foo {
    static public function 
test() {
        print 
"Hello world!\n";
    }
}

call_user_func(__NAMESPACE__ .'::Foo::test'); // As of PHP 5.3.0
// Hello world!
call_user_func(array(__NAMESPACE__ .'::Foo''test')); // As of PHP 5.3.0
// Hello world!

?>

Example #3 Using a class method

<?php

class myclass {
    static function 
say_hello()
    {
        echo 
"Hello!\n";
    }
}

$classname "myclass";

call_user_func(array($classname'say_hello'));
call_user_func($classname .'::say_hello'); // As of 5.2.3

?>

Example #4 Using lambda function

<?php

call_user_func
(function($arg) { print "[$arg]\n"; }, 'test'); /* As of PHP 5.3.0 */
// [test]

?>

See Also