session counter fixed

TemplateEngine.md

@@ -107,7 +107,8 @@ Cookie:PHPSESSID=5q8sgn2j1kj0jk4j5u8rldo5p1
 <?php
 session_start();
 if (!isset($_SESSION['counter'])){
-    $_SESSION['counter'] ++;
+    $_SESSION['counter'] = 0;
 }
+$_SESSION['counter'] ++;
 echo $_SESSION['counter'];
 ```

TemplateEngine/session.counter.php

@@ -1,6 +1,7 @@
 <?php
 session_start();
 if (!isset($_SESSION['counter'])){
-    $_SESSION['counter'] ++;
+    $_SESSION['counter'] = 0;
 }
+$_SESSION['counter'] ++;
 echo $_SESSION['counter'];