Manual:Extensions/es

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¿Qué son las extensiones?
Las extensiones permiten personalizar cómo funciona y se ve MediaWiki.

Los Wikiusuarios pueden navegar a través de las extensiones existentes o solicitar una nueva extensión. Los administradores del sistema pueden instalar (o remover) extensiones en las instalaciones de MediaWiki que administran. Los desarrolladores pueden escribir nuevas extensiones o mejorar o mantener las extensiones existentes.

Buscar por palabra(s) clave la extension:
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Dependiendo de sus metas que pueda utilizar extensiones para:


 * ampliar el marcado wiki utilizado para escribir artículos - ver Category:Parser function extensions y Category:Parser extensions por ejemplo.
 * añadir nuevos informes y las capacidades administrativas - ver Category:Special page extensions por ejemplo.
 * cambiar la apariencia de MediaWiki - verGallery of user styles and Category:User interface extensions por ejemplo.
 * mejorar la seguridad a través de mecanismos de autenticación personalizados - verCategory:Authentication and Authorization Extensions por ejemplo.

Mientras que algunas extensiones son mantenidas por los desarrolladores de MediaWiki, otras fueron escritas por desarrolladores de terceros. Como resultado, muchas tienen errores, y no están garantizadas para ser compatibles entre sí. Algunas están sin mantenimiento, no todas las extensiones funcionan en todas las versiones de MediaWiki. Utilizar cualquier extensión, especialmente las etiquetadas como insegura, bajo su propio riesgo. Cuando se utiliza una extensión que requiere parches al código del núcleo MediaWiki o las entradas en la base de datos, asegúrese de crear una copia de seguridad de su base de datos y/o código del núcleo MediaWiki, para evitar el riesgo de dañar permanentemente su wiki.

Browsing extensions
You can browse to see the full range of extensions that have already been written. may also be helpful to pick out extensions. For information on installing these extensions or writing your own, see below.

Checking installed extensions
Only someone with administration access to the filesystem (and often the database too) on a server can install extensions for MediaWiki, but anyone can check which extensions are active on an instance of MediaWiki by accessing the Special:Version page. For example, these extensions are active in the English Wikipedia.

Installing an extension
MediaWiki is ready to accept extensions just after installation is finished. To add an extension follow these steps:


 * 1) Before you start
 * Many extensions provide instructions designed for installation using unix commands. You require shell access (SSH) to enter these commands listed on the extension help pages.
 * 1) Download your extension.
 * Extension Distributor helps you to select and download most of the popular extensions.
 * Extensions are usually distributed as modular packages. They generally go in their own subdirectory of .  A list of extensions stored in the Wikimedia Git repository is located at git:mediawiki/extensions. Some extensions don't use version control are not recommended.
 * Some extensions are also available in bundles, or package repositories.
 * 1) Install your extension..
 * Generally, at the end of the  file (but above the PHP end-of-code delimiter, " ", if present), the following line should be added:
 * This line forces the PHP interpreter to read the extension file, and thereby make it accessible to MediaWiki.
 * Some extensions can conflict with maintenance scripts, for example if they directly access $_SERVER (not recommended).
 * In this case they can be wrapped in the conditional so maintenance scripts can still run.
 * In this case they can be wrapped in the conditional so maintenance scripts can still run.


 * The maintenance script will fail for any extension which requires customized namespaces which is included inside the conditional above such as,.


 * Ensure that required permissions are set for extensions!
 * While this installation procedure is sufficient for most extensions, some require a different installation procedure. Check your extension's documentation for details.
 * If you want to alter configuration variables in LocalSettings.php, you have to do this typically after including the extension. Otherwise defaults defined in the extension will overwrite your settings.
 * While extension declaration can be placed in other places within the LocalSettings.php file, never place extensions before the  line for MediaWiki versions below 1.17 . Doing so will blank the extension setup function arrays, causing no extensions to be installed, and probably will make your wiki inaccessible until you fix it!

Upgrading an extension
Some extensions require to be updated whenever you update MediaWiki, while others work with multiple versions. To upgrade to a new version of an extension:


 * 1) Download the new version of the extension
 * 2) Replace all the extension files in the extension/ExtensionName directory with the new files. Do not remove the extension configuration present in LocalSettings.php
 * 3) Depending on the extension, you may have to run the Update.php maintenance script. Most extensions will mention if this script needs to be run or not. (Running the update.php script when its unnecessary will not hurt anything, so if you're unsure don't be afraid to run it). If you don't have command line access, you can also use the web updater.
 * 4) That's all you need to do. In most cases any extension configuration you have in LocalSettings.php will also work with the newer version of the extension.

These instructions cover 99% of extensions. If the specific extension you are upgrading has instructions that differ from these, you should probably follow the specific extension's instructions

Uninstalling an extension
Extensions are added by adding a line to LocalSettings.php, which basically looks like this:

Depending on the extension you want to uninstall additionally other stuff might be done on installation, which you want to undo now. For details see the section on installing an extension.


 * 1) Remove this line and the extension is uninstalled. If you want to, you can (and if you do not want to use this extension in the future you should) remove the files of this extension inside the folder "extensions/".
 * 2) Maybe you also have some other lines in LocalSettings.php, which have to do with the extension you want to remove. Most likely this will be lines, which give certain users the right to access pages, which are provided by the extension. These lines contain the variable "$wgGroupPermissions" and make some settings there. As far as they have to do with rights, which come from the removed extension, you can remove these lines as well.
 * 3) Maybe your extension also has added columns to your database. The updater maintenance/update.php removes them, when you run it, after you have uninstalled the extension.

Developing extensions
This complex topic is handled on the developing extensions manual page.