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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.

PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.

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call_user_func

(PHP 3 >= 3.0.3, PHP 4, PHP 5)

call_user_func -- Call 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. Using a class method

<?php
class myclass {
    function say_hello()
    {
        echo "Hello!\n";
    }
}

$classname = "myclass";

call_user_func(array($classname, 'say_hello'));
?>

See Also

call_user_func_array()
is_callable()
information about the callback type

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Another Useful functions:


zend-api.zend-std-call-user-call | zend-api.zend-objects-store-call-destructors | zend-api.zend-call-method | zend-api.zend-call-method-with-2-params | zend-api.zend-call-method-with-1-params | zend-api.zend-call-method-with-0-params | zend-api.zend-call-function | zend-api.call-user-function | zend-api.call-user-function-ex | function.xmlrpc-server-create | function.xmlrpc-server-call-method | function.xmlrpc-server-call-method | function.xmlrpc-server-add-introspection-data | function.w32api-set-call-method | function.call-user-method | function.call-user-method-array | function.call-user-func | function.call-user-func-array |


PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.