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ftp_systype	call_user_func_array

Last updated: Tue, 09 Jul 2002 view the printer friendly version or the printer friendly version with notes or change language to English \| Brazilian Portuguese \| Chinese \| Czech \| Dutch \| Finnish \| German \| Hungarian \| Italian \| Japanese \| Korean \| Polish \| Romanian \| Russian \| Spanish \| Swedish \| Turkish

XXXIV. Fonctions

Ces fonctions effectuent les manipulations li�es � la gestion des fonctions.

Table des mati�res
call_user_func_array -- Appelle une fonction utilisateur avec les param�tres rassembl�s en tableau
call_user_func -- Appelle une fonction utilisateur
create_function -- Cr�e une fonction anonyme (style lambda)
func_get_arg -- Retourne un �l�ment de la liste des arguments
func_get_args -- Retourne les arguments d'une fonction sous forme de tableau
func_num_args -- Retourne le nombre d'arguments pass� � la fonction
function_exists -- Indique si une fonction est d�finie.
get_defined_functions -- Liste toutes les fonctions d�finies
register_shutdown_function -- Enregistre une fonction pour ex�cution � l'extinction
register_tick_function -- Enregistre une fonction ex�cut�e � chaque tick
unregister_tick_function -- Annule la fonction ex�cut�e � chaque tick

User Contributed Notes
Fonctions

[email protected]
23-Aug-2002 08:49

You can do some kind of overloading functions in PHP using
"function_exists". 

Let's suppose you want a script to
call plugins that are php files and you want the plugins to
"override" behaviours that if not overriden are used by
default.

You might for example write a "mySQL table
viewer" which displays a table and it "opens a table",
"dumps the header", "dumps row-by-row" and then
"closes the table".

Let's suppose you want a plugin for
"Stocks" which prints negative stocks in red, so you want to
override the "dumping row-by-row" to do that behaviour. Instead
you do not want to have all the "default behaviour" repeated in
the plugin.

You may then do the following:

1) Define a
default plugin (ex: "default.php"

2) Write all your
functions in default.php to open, dump and close, but add them a
suffix:

open_table_default()
dump_header_default()
dump_row_default()
close_table_default()

3)
Call your functions with a wrapper: Insetad of this:
open_table() or
open_table_default() write
this:

plugincall("open_table");

4) Then write a
function called plugincall which uses function_exists() to see if you call
one or the other function:

function
plugincall($desired_function_name)
{

if( function_exists(
$desired_function_name))
{
    //Call the plugin
    //Note the $
before the name
    $desired_function_name()
}
else
{
 
$desired_function_name = $desired_function_name .
"_default";
  if(
function_exists($desired_function_name))
  {
      //Call the
default
      //Note the $ before the name
     
$desired_function_name()
  }
  else
  {
      // Nor the
plugin nor the default were defined
  }
}

So, now, if the
require_once(plugin.php) contains a function called
"open_table()", it will be used. Instaed,
"open_table_default()" will be used.

It's not like
overloading functions, but it is very useful to write scripts ampliable by
other programmers: If they write a function, it is used, if not, the
default is used.

See ya!
Xavier Montero.

ftp_systype	call_user_func_array

Last updated: Tue, 09 Jul 2002

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