call_user_func_array
Name
call_user_func_array — Alternate method for calling
functions.
Synopsis
mixed call_user_func_array(function_name[, argument_array]);
string function_name:
Function to be called
array argument_array
(optional): Array of arguments to be passed to
function_name
Returns
Return value of function_name; if function_name is not a
valid function name, the function generates a warning and
no value is returned.
Description
call_user_func_array() is primarily useful as a
way to dynamically call functions and methods at runtime
without having to use eval() .
call_user_func_array() passes the elements in argument_array to function_name as an argument list. This
makes it easy to pass an unknown number of arguments to a
function. See the example for details.
Normally, functions are called with the following syntax:
function_name ('arg one', 'arg two', ...);
Calling the same function using
call_user_func_array() would look like this:
call_user_func_array ('function_name', array ('arg one', 'arg two', ...));
The function name is somewhat of a misnomer - any PHP
function can be called using this function. Watch out for
language constructs like print() , echo() , unset() , etc. Attempts to
call these constructs using this function will generate a
warning.
To call a method using this function, use the following
syntax:
$result = call_user_func_array (array (&$object, 'method'), array ($arg1, $arg2, ...));
Version
PHP Version: 4.0.4+
Example
Example 377. Call a function
using call_user_func_array()
<pre>
<?php
$function_name = 'printf';
$argv = array ("%-'.45s$%0.2f\n", "Total Cost", 1.1);
// Call printf using call_user_func_array
call_user_func_array ($function_name, $argv);
?>
</pre>
PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing
(Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch).
This material may be distributed only subject to the terms and conditions set forth
in the Open Publication License, v1.0 or later (the latest version is presently available at
http://www.opencontent.org/openpub/).
The authors of this book have elected not to choose any options under the OPL. This online book was obtained
from
http://www.fooassociates.com/phpfer/
and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4
for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All
persons and entities shall have neither liability nor responsibility to any person or entity with respect to
any loss or damage arising from the information contained in this book.
PhpDig.net