php manual PHP Manual - ref.funchand

PHP, short for "PHP: Hypertext Preprocessor", is an open-source, reflective programming language used mainly for developing server-side applications and dynamic web content, and more recently, other software.

PHP allows interaction with a large number of relational database management systems, such as MySQL, Oracle, IBM DB2, Microsoft SQL Server, PostgreSQL and SQLite. PHP runs on most major operating systems, including UNIX, Linux, Windows, and Mac OS X, and can interact with many major web servers. The official PHP website contains extensive documentation.

There is a command line interface, as well as GUI libraries such as the Gimp Tool Kit (GTK+) and text mode libraries like Ncurses and Newt.

PHP is the result of the efforts of many contributors. It is licensed under the PHP License, a BSD-style license. Since version 4, it has been powered by the Zend engine.

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Function Handling Functions

XLIV. Function Handling Functions


These functions all handle various operations involved in working with functions.


No external libraries are needed to build this extension.


There is no installation needed to use these functions; they are part of the PHP core.

Runtime Configuration

This extension has no configuration directives defined in php.ini.

Predefined Constants

This extension has no constants defined.

Table of Contents
call_user_func_array --  Call a user function given with an array of parameters
call_user_func --  Call a user function given by the first parameter
create_function -- Create an anonymous (lambda-style) function
func_get_arg -- Return an item from the argument list
func_get_args --  Returns an array comprising a function's argument list
func_num_args --  Returns the number of arguments passed to the function
function_exists --  Return TRUE if the given function has been defined
get_defined_functions --  Returns an array of all defined functions
register_shutdown_function --  Register a function for execution on shutdown
register_tick_function --  Register a function for execution on each tick
unregister_tick_function --  De-register a function for execution on each tick