added old project files

php/checkSessionValidity.php

@@ -0,0 +1,23 @@
+<?php
+if(isset($_COOKIE['LAST_ACTIVITY']))
+{
+if (time() - $_COOKIE['LAST_ACTIVITY'] > 86400) {
+    // last activity is more than 10 minutes ago
+
+	session_destroy();
+	echo "you are logged out because of the 10 minutes...";
+	exit();
+} else {
+    // update last activity timestamp
+    //echo "updated timestamp";
+	//printf("timestamp updated %d seconds left", 3600 - (time() - $_SESSION['LAST_ACTIVITY']));
+	$_COOKIE['LAST_ACTIVITY'] = time();
+}
+}else
+{
+	echo "no cookie...";
+	exit();
+}
+
+
+?>