最近在研究WordPress多站点创建WordPress的Saas自助建站平台，过程中我需要在前台显示该平台中所有预制插件的信息，并以列表的形式显示出来，以方便用户查看。于是用到了函数get_plugins();

get_plugins()获取某个目录下的所有插件信息

描述

Check the plugins directory and retrieve all plugin files with plugin data.

WordPress only supports plugin files in the base plugins directory (wp-content/plugins) and in one directory below the plugins directory (wp-content/plugins/my-plugin). The file it looks for has the plugin data and must be found in those two locations. It is recommended that you keep your plugin files in directories.

The file with the plugin data is the file that will be included and therefore needs to have the main execution for the plugin. This does not mean everything must be contained in the file and it is recommended that the file be split for maintainability. Keep everything in one file for extreme optimization purposes.

用法

<?php get_plugins( $plugin_folder ) ?>

参数

$plugin_folder

(string) (可选) Relative path to single plugin folder.

默认值: ''

返回值

(array)

Key is the plugin file path and the value is an array of the plugin data.

事例

Get All Plugins

The following code snippet returns all plugins installed on your site (not just activated ones).

/* ----------------------------------
 * wordpress之魂 © http://wphun.com
 * ---------------------------------- */

<?php 

// Check if get_plugins() function exists. This is required on the front end of the
// site, since it is in a file that is normally only loaded in the admin.
if ( ! function_exists( 'get_plugins' ) ) {
	require_once ABSPATH . 'wp-admin/includes/plugin.php';
}

$all_plugins = get_plugins();

// Save the data to the error log so you can see what the array format is like.
error_log( print_r( $all_plugins, true ) );

Example output:

/* ----------------------------------
 * wordpress之魂 © http://wphun.com
 * ---------------------------------- */

Array
(
    [hello-dolly/hello.php] => Array
        (
            [Name] => Hello Dolly
            [PluginURI] => http://wordpress.org/extend/plugins/hello-dolly/
            [Version] => 1.6
            [Description] => This is not just a plugin, it symbolizes the hope and enthusiasm of an entire generation summed up in two words sung most famously by Louis Armstrong: Hello, Dolly. When activated you will randomly see a lyric from <cite>Hello, Dolly</cite> in the upper right of your admin screen on every page.
            [Author] => Matt Mullenweg
            [AuthorURI] => http://ma.tt/
            [TextDomain] => 
            [DomainPath] => 
            [Network] => 
            [Title] => Hello Dolly
            [AuthorName] => Matt Mullenweg

)

源文件

get_plugins() 函数的代码位于 /wp-admin/includes/plugin.php.

/* ----------------------------------
 * wordpress之魂 © http://wphun.com
 * ---------------------------------- */
/**
 * Check the plugins directory and retrieve all plugin files with plugin data.
 *
 * WordPress only supports plugin files in the base plugins directory
 * (wp-content/plugins) and in one directory above the plugins directory
 * (wp-content/plugins/my-plugin). The file it looks for has the plugin data
 * and must be found in those two locations. It is recommended to keep your
 * plugin files in their own directories.
 *
 * The file with the plugin data is the file that will be included and therefore
 * needs to have the main execution for the plugin. This does not mean
 * everything must be contained in the file and it is recommended that the file
 * be split for maintainability. Keep everything in one file for extreme
 * optimization purposes.
 *
 * @since 1.5.0
 *
 * @param string $plugin_folder Optional. Relative path to single plugin folder.
 * @return array Key is the plugin file path and the value is an array of the plugin data.
 */
function get_plugins($plugin_folder = '') {

	if ( ! $cache_plugins = wp_cache_get('plugins', 'plugins') )
		$cache_plugins = array();

	if ( isset($cache_plugins[ $plugin_folder ]) )
		return $cache_plugins[ $plugin_folder ];

	$wp_plugins = array ();
	$plugin_root = WP_PLUGIN_DIR;
	if ( !empty($plugin_folder) )
		$plugin_root .= $plugin_folder;

	// Files in wp-content/plugins directory
	$plugins_dir = @ opendir( $plugin_root);
	$plugin_files = array();
	if ( $plugins_dir ) {
		while (($file = readdir( $plugins_dir ) ) !== false ) {
			if ( substr($file, 0, 1) == '.' )
				continue;
			if ( is_dir( $plugin_root.'/'.$file ) ) {
				$plugins_subdir = @ opendir( $plugin_root.'/'.$file );
				if ( $plugins_subdir ) {
					while (($subfile = readdir( $plugins_subdir ) ) !== false ) {
						if ( substr($subfile, 0, 1) == '.' )
							continue;
						if ( substr($subfile, -4) == '.php' )
							$plugin_files[] = "$file/$subfile";
					}
					closedir( $plugins_subdir );
				}
			} else {
				if ( substr($file, -4) == '.php' )
					$plugin_files[] = $file;
			}
		}
		closedir( $plugins_dir );
	}

	if ( empty($plugin_files) )
		return $wp_plugins;

	foreach ( $plugin_files as $plugin_file ) {
		if ( !is_readable( "$plugin_root/$plugin_file" ) )
			continue;

		$plugin_data = get_plugin_data( "$plugin_root/$plugin_file", false, false ); //Do not apply markup/translate as it'll be cached.

		if ( empty ( $plugin_data['Name'] ) )
			continue;

		$wp_plugins[plugin_basename( $plugin_file )] = $plugin_data;
	}

	uasort( $wp_plugins, '_sort_uname_callback' );

	$cache_plugins[ $plugin_folder ] = $wp_plugins;
	wp_cache_set('plugins', $cache_plugins, 'plugins');

	return $wp_plugins;
}