Added convenience function to read from header

lib/Request.php

@@ -125,6 +125,22 @@
             return null;
         }
 
+        public static function getHeader($strKey)
+        {
+            if (is_array($_SERVER))
+            {
+                $strHeaderKey = "HTTP_{$strKey}";
+                $strHeaderKey = strtoupper($strHeaderKey);
+                $strHeaderKey = preg_replace("/\-/", "_", $strHeaderKey);
+
+                if (array_key_exists($strHeaderKey, $_SERVER))
+                    if (strlen($_SERVER[$strHeaderKey]) > 0)
+                        return $_SERVER[$strHeaderKey];
+            }
+
+            return null;
+        }
+
         // Returns true if all of the arguments are in the POST request
         // To be used like:
         // if (Request::posts("param1", "param2")) {