get_mu_plugins()

function get_mu_plugins() {
	$wp_plugins = array();
	// Files in wp-content/mu-plugins directory
	$plugin_files = array();

	if ( ! is_dir( WPMU_PLUGIN_DIR ) )
		return $wp_plugins;
	if ( $plugins_dir = @ opendir( WPMU_PLUGIN_DIR ) ) {
		while ( ( $file = readdir( $plugins_dir ) ) !== false ) {
			if ( substr( $file, -4 ) == '.php' )
				$plugin_files[] = $file;
		}
	} else {
		return $wp_plugins;
	}

	@closedir( $plugins_dir );

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

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

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

		if ( empty ( $plugin_data['Name'] ) )
			$plugin_data['Name'] = $plugin_file;

		$wp_plugins[ $plugin_file ] = $plugin_data;
	}

	if ( isset( $wp_plugins['index.php'] ) && filesize( WPMU_PLUGIN_DIR . '/index.php') <= 30 ) // silence is golden
		unset( $wp_plugins['index.php'] );

	uasort( $wp_plugins, '_sort_uname_callback' );

	return $wp_plugins;
}