PHP configuration/fr

PHP is a web template system that accidentally grew up into a fairly general language. PHP's syntax, capabilities, and execution model bear vague similarities to Perl; scripts are loaded by an "interpreter", compiled to bytecode, and then executed. The PHP interpreter can be run from the command line, CGI-style, or more commonly as an in-process Apache module.

Compatibilité MediaWiki
Voir les versions de PHP compatibles avec votre version de MediaWiki sur Compatibility#PHP

Installation
Veuillez voir http://php.net/install.

Requis
Les extensions suivantes sont nécessaires à MediaWiki :
 * Perl Compatible Regular Expressions : gestion des expressions régulières via PERL
 * Session
 * Standard PHP Library
 * Document Object Module
 * iconv gestion de l'encoding des caractères (conversion)
 * JSON (alternatively, the pecl-json-c fork)
 * Au moins un gestionnaire de base de données :
 * MySQL
 * PostgreSQL
 * SQLite (through PDO)
 * MySQLi, MySQL et PostgreSQL via PDO ne sont pas compatibles

Perl Compatible Regular Expressions, Session, Standard PHP Library et JSON sont activés par défaut ; Perl Compatible Regular Expressions et Standard PHP Library sont nécessaires depuis PHP 5.3.

Facultatif
MediaWiki nécessite ou demande un certain nombre de composants optionnels de PHP qui doivent être activés à la compilation :
 * mbstring gestion des chaines de caractères sur n octets (facultatif mais un code moins performant sera utilisé si mbstring n'est pas disponible)
 * zlib librairie de compression, utilisée également pour compresser les fichiers en cache
 * sockets support for network communication, if using memcached
 * FastStringSearch

Exemple
Nous travaillons avec succès avec ces options de compilation:

 './configure' \ '--with-mysql' \ '--with-apxs2=/usr/sbin/apxs2' \ '--with-zlib' \ '--with-ldap' \ '--with-gd' \ '--with-jpeg-dir' \ '--with-iconv-dir' \ '--enable-mbstring' In detail, these configure options do the following:


 * --with-mysql : Allows PHP to query MySQL. This is an essential feature (I think). You will need to have MySQL installed to enable this option.
 * --with-apxs2=/usr/sbin/apxs2 : this is required if you want to build mod_php. APXS is for configuring compilation of an Apache module. You will need to change (or omit the path) for your specific system.
 * --with-zlib : Allows PHP to read / write zipped files and send compressed data to Apache ... or something like that
 * --with-ldap : Important if you want your wiki users to be verified by LDAP
 * --with-gd : Use this if you want image processing 'within' PHP, else you can use ImageMagick. Because this option requires that you have various libraries installed... but presumably IM has the same deps... oh well...
 * --with-jpeg-dir : Seems nonsensical
 * --with-iconv-dir : Seems nonsensical
 * --enable-mbstring : Allows multibyte character string support. This is optional, as slower custom code will be used if not available.

Opcode caching

 * see Manual:Cache

Due to MediaWiki's large codebase, it is highly recommended that a system be used to cache the compiled scripts; there are a number of such plugins for PHP, some free, some proprietary. There is a list of some caches:
 * Alternative PHP Cache -- used at Wikimedia
 * Windows Cache Extension for PHP -- recommended for IIS users

Fortunately, these all seem to be easy to install as Zend plugins, you just drop in a library and change your php.ini. No fussy recompiling of the entire PHP!

Depending on the cache and options used, you may have to perform a special operation whenever updating script files.

MediaWiki can also interact with that caches and use them for object caching, see.

Runtime configuration (php.ini)
Some settings in php.ini affects MediaWiki behavior and some of them are incompatible with MediaWiki


 * register_globals
 * Enabling this is a major security risk and can be used for XSS attacks; MediaWiki doesn't require it, so please turn it off if you can!


 * safe_mode
 * Safe mode is an ill-conceived, broken-by-design setting in PHP; MediaWiki can work with this option on, but some features won't work.


 * magic_quotes_gpc
 * This options adds quotes to data in,   and  . MediaWiki can work with this option turned on, but will have to remove these quotes and thus will be slower.


 * magic_quotes_runtime
 * This option corrupts data input unpredictably by adding quotes in e.g. opened files, data received from database etc. MediaWiki will refuse to install if this option is turned on.


 * magic_quotes_sybase
 * same as magic_quotes_runtime


 * mbstring.func_overload
 * This option causes errors and may corrupt data unpredictably; MediaWiki will refuse to install if this option is turned on.


 * zend.ze1_compatibility_mode
 * This option causes horrible bugs; MediaWiki will refuse to install if this option is turned on.


 * memory_limit
 * MediaWiki needs sufficiently memory to work. The minimal limit should be something like 20 MB, but if you want MediaWiki to work correctly, consider using at least 50 MB.


 * disable_functions
 * To be able to find GNU diff3 and git during installation process this entry must not contain passthru

Image Resizing
ImageMagick can be used for image resizing When it is not available the GD PHP module is used instead where found.

Voir aussi

 * PHP Knowledgebase
 * PHP Tutorials
 * Suhosin (Hardened-PHP Project patch and extension)
 * Simple PHP Tutorials