=== PHP version requirement ===
As of 1.27, MediaWiki now requires PHP 5.5.9 or higher. This corresponds with
-HHVM 3.1.
+HHVM 3.1. Additionally, the following PHP extensions are required:
+* ctype
+* iconv
+* json
+* mbstring
+* xml
=== Configuration changes in 1.27 ===
* $wgAllowMicrodataAttributes and $wgAllowRdfaAttributes were removed,