public static function check_dependency( $plugin_file_array ) {
		$plugins = (array) get_option( 'active_plugins' );
		foreach ( (array) $plugin_file_array as $file ) {
			$found = false;
			foreach ( $plugins as $plugin ) {
				if ( false !== strpos( $plugin, $file ) ) {
					$found = true;
					break;
				}
			}
			// This plugin is not found.
			// So, check failed.
			if ( ! $found ) {
				return false;
			}
		}
		return true;
	}