Added more cheats to the php cheatsheet.

cheatsheets/php

@@ -4,12 +4,18 @@ php -v
 # To view the installed php modules:
 php -m
 
-# To enter an interactive shell:
-php -a
-
 # To view phpinfo() information:
 php -i
 
+# To lint a php file:
+php -l file.php
+
+# To lint all php files within the cwd:
+find . -name "*.php" -print0 | xargs -0 -n1 -P8 php -l
+
+# To enter an interactive shell:
+php -a
+
 # To locate the system's php.ini files:
 php -i | grep "php.ini"