Add Movim in PHP.

content/php.md

@@ -48,6 +48,7 @@
 
 - Social
   - [ThinkUp](https://www.thinkup.com/)
+  - [Movim](http://movim.eu/?q=mainPage): self-hosted social network.
 
 - Social bookmarking
   - [Poche](http://inthepoche.com/): a read-it-later clone (french)