diff --git a/languages/php.php b/languages/php.php
index 4c8d311..a080fe0 100644
--- a/languages/php.php
+++ b/languages/php.php
@@ -1,5 +1,20 @@
 <?php
 
+/**
+ * Global variable
+ */
+$_SERVER; // SERVER variables
+$_GET; // Query params
+$_POST; // Post fields
+$_REQUEST; // GET and POST together
+$GLOBALS; // Collection of global variables
+$_SESSION; // Browser session
+$_FILES; // Array of files that are sent in request
+$_COOKIE; // Array of cookies sent in request
+$_ENV; // php.ini options
+$argv; // Array of terminal arguments (filename included)
+$argc; // Number of arguments passed into terminal
+
 /**
  * Class 
  * http://php.net/manual/en/language.oop5.basic.php