您可以使用以下代码：

    <?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();

print_r( $all_plugins);

  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

    )

如果您不在多站点安装上，则可以使用以下代码激活插件：

$active_plugins = get_option( \'active_plugins\', array() );