Added a PHP cheatsheet.

cheatsheets/php

@@ -0,0 +1,17 @@
+To view the PHP version:
+php -v
+
+To view the installed php modules:
+php -m
+
+To enter an interactive shell:
+php -a
+
+To view phpinfo() information:
+php -i
+
+To locate the system's php.ini files:
+php -i | grep "php.ini"
+
+To start a local webserver for the cwd on port 3000 (requires php >= 5.4):
+php -S localhost:3000