call_user

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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");
?>

Object methods may also be invoked statically using this function by passing array($objectname, $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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