php - call_user_func

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 743. 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 744. Using a class method

<?php


class myclass {


function say_hello()
{
echo "Hello!\n";
}
}
$classname = "myclass";
call_user_func(array($classname, 'say_hello'));


?>