convert to support multiple queries

index.php

@@ -0,0 +1,12 @@
+<?php
+$file = 'contact.txt';
+
+if(isset($_GET["contact"])) {
+  file_put_contents($file, $_GET['contact']);
+}
+
+$oncall = file_get_contents('./contact.txt');
+
+echo("Current person on call is now $oncall");
+
+?>