Merge pull request #656 from smtaydemir/patch-2

add #php

free-programming-books-tr.md

@@ -5,7 +5,8 @@
 * [Git](#git)
 * [JavaScript](#javascript)
 * [LaTeX](#latex)
-* [Linux](#linux) 
+* [Linux](#linux)
+* [PHP](#php)
 * [Matlab](#matlab)
 * [Python](#python)
 * [Java](#java)