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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. Take the following:

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

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

`<?php class myclass { function say_hello() { echo "Hello!\n"; } } $classname = "myclass"; call_user_func(array($classname, 'say_hello')); ?>`

> 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 ?>`

See also: is_callable(), call_user_func_array(), and information about the callback type.

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