add PHP instructions to the README

README.md

@@ -17,3 +17,10 @@ busybox httpd -p 1337 -f
 ```
 
 _(Note: Alpine Linux now splits Busybox into multiple packages: `apk add busybox-extras`)_
+
+## PHP
+
+PHP has a built-in server which can come in handy. For this example there is an `index.php` with `index.sh.html` compatible instructions but PHP is quite easy to write so it's better without this extra hoop.
+```sh
+php -S 0.0.0.0:1337
+```