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WordPress Plugins are composed of PHP scripts that extend the functionality of WordPress. They offer new additions to your blog that either enhance features that were already available or add otherwise unavailable new features to your site.
The majority of WordPress users don't require Plugins, or only require a few, such as Plugins dealing with comment spam or customized post listings. Other users enjoy the varied options Plugins provide such as frequently updated weather reports, post word counts, rating systems, and more. WordPress Plugins are optional, based upon the needs of the user, and thus they are not incorporated into the core of WordPress.
Plugins available via the WordPress Plugins Directory site are designed by volunteers and are usually free to the public. WordPress Plugins hosted in the WordPress Plugins Directory are considered thoroughly tested and "safe." Remember, WordPress Plugins are the responsibility of the author and the user, and they are typically works-in-progress as WordPress grows and expands.
If you want to develop your own Plugins, there is a comprehensive list of resources at Plugin Resources.
You can find WordPress Plugins in the Administration Screens > Plugins > Add New screen, or directly via the WordPress Plugins Directory.
Check the WordPress Plugin listing on the Plugins List on your WordPress site, or on the WordPress Plugins Directory to determine compatibility and if updates are available.
If a WordPress Plugin update is available, it will be shown on the Dashboard screen, an alert on the Plugin's menu title, and on the Plugin List. Follow the instructions to update the Plugin.
If a WordPress Plugin is not compatible or updated for the next release of WordPress, contact the Plugin author directly for information on the next update and compatibility issues.
Some WordPress Plugins require more steps to customize them. The Details ReadMe file should contain step-by-step instructions. After installation, this information is available on the Plugins Screen for each Plugin. If you are having problems with a WordPress Plugin, see the Troubleshooting section.
For information on how to install a WordPress Plugin manually, see our manual installation guides below.
Manual WordPress Plugin installation is commonly done in two ways. Either by uploading by FTP or uploading directly to WordPress by Zip archive. See our guides for each below.
There are a few cases when manually installing a WordPress Plugin is appropriate.
Installation of a WordPress Plugin manually requires FTP familiarity and the awareness that you may put your site at risk if you install a WordPress Plugin incompatible with the current version or from an unreliable source.
Backup your site completely before proceeding.
To install a WordPress Plugin manually:
Check the Details readme file for customization and further instructions.
In cases for custom, premium, or when you have a local copy of a WordPress Plugin as a Zip Archive, those Plugins can be uploaded to WordPress directly.
Backup your site completely before proceeding.
To install a WordPress Plugin manually by zip archive upload:
The ability to favorite a plugin was added to the WordPress Plugins Directory in 2012. WordPress Version 3.5 introduced the ability to display and easily install a user's favorite plugins from the Add New plugins page of the dashboard.
Once you have favorited a plugin, it will show up in your public profile, as well as your rating of the plugin, if applicable.
Occasionally, a WordPress Plugin may not work as expected, or at all, or conflict with another WordPress Plugin.
If you are experiencing problems with a Plugin you installed or one that stopped working after upgrades, the following are the steps you need to take to troubleshoot the Plugin:
To uninstall a WordPress Plugin:
The Plugin will initiate the deactivation.
Most WordPress Plugins have an option to completely uninstall themselves, though not all. If you wish to remove a WordPress Plugin permanently:
The following are WordPress Plugin tips and techniques for advanced users and developers.
Plugins are managed from the Plugins Screen in the Administration Screens of your WordPress site. All Plugins listed on this screen are found in your wp-content/plugins directory. Each Plugin has a description in its header section of what it does, an author and website to refer to, and a version number. If you do not see the Plugin in the list of installed Plugins, most likely it is missing the "File Header":
<?php /* Plugin Name: Magic Plugin Plugin URI: http://example.com/magic-plugin Description: Magic Plugin performs magic Version: 2.3 Author: Mr. Magic Author URI: http://example.com/ */
The header section defines:
Most WordPress Plugins no longer require direct modification to a WordPress Theme. If you are using a WordPress Plugin that does require direct modification, you need to know:
If you are using the Multisite version of WordPress, Must Use Plugins are special WordPress Plugins installed in a special directory next to the normal /plugins/ dir (/mu-plugins/). They are 'must-use' because once their file is placed in the /mu-plugins/ directory they are instantly activated and cannot be de-activated using the Plugins Screen.
Must-use Plugins are useful for installing WordPress Plugins on all sites in a Multisite installation to make WordPress Plugins' functionalities available across the entire blog network. They are loaded before normal Plugins by PHP, which means that code and hooked-functions registered in a must-use Plugin can be assumed available to all other Plugins.
See Must Use Plugins and Create A Network for more details.
When activated, some WordPress Plugins add tags to the template files. Upon such a Plugin's deactivation, these tags may remain in place and can affect the look and/or functionality of the Theme, resulting in errors or even failures to load. It is therefore imperative to prevent the Plugin from being detected and used if it is deactivated.
To determine if such a condition exists, you can add some PHP code to the template file where the Plugin was used, and perform a simple function_exists() check. To do so, add the code in the example below and configure it for the function you'd like to check. Then upload the modified template to your WordPress Content folder.
The if (function_exists()) checks for the Plugin, and if it exists (activated or not), it will use it. If it returns FALSE or "not found", it will ignore the Plugin tag and continue loading the page.
<?php if (function_exists('FUNCTION NAME')) { FUNCTION_NAME(); } ?>
This example Plugin uses a function called alex_get_shoutbox() to print out its contents.
<?php if (function_exists('alex_get_shoutbox')) { alex_get_shoutbox(); } ?>
Once you start using WordPress Plugins, you sometimes wonder how you ever got along without them. If you have knowledge of PHP, you can develop your own Plugins, and there is a comprehensive list of resources at Plugin Resources to get you started.