Standards follow PSR-0 to -2.

Actually those are based on Horde's coding standards. ;-)

horde/docs/CODING_STANDARDS

@@ -2,12 +2,21 @@
  Horde Coding Standards
 ========================
 
-:Authors:       Jon Parise, Chuck Hagenbuch
 :Contact:       dev@lists.horde.org
 
 .. contents:: Contents
 .. section-numbering::
 
+
+Basics
+======
+
+Horde Coding Standards are following PSR-0, PSR-1 and PSR-2 of the `PHP
+Framework Interop Group`_
+
+.. _`PHP Framework Interop Group`: http://www.php-fig.org/
+
+
 Indenting/Whitespace
 ====================