Fix compatibility with PHP 5.2

program/lib/Roundcube/rcube_plugin_api.php

@@ -233,7 +233,7 @@ class rcube_plugin_api
 
     /**
      * Get information about a specific plugin.
-     * This is either provided my a plugin's info() method or extracted from a package.xml or a composer.json file
+     * This is either provided by a plugin's info() method or extracted from a package.xml or a composer.json file
      *
      * @param string Plugin name
      * @return array Meta information about a plugin or False if plugin was not found
@@ -279,7 +279,7 @@ class rcube_plugin_api
         include($fn);
 
       if (class_exists($plugin_name))
-        $info = $plugin_name::info();
+        $info = call_user_func(array($plugin_name, 'info'));
 
       // fall back to composer.json file
       if (!$info) {