if statement for checking if posts file exists

index.php

@@ -109,8 +109,10 @@
         
         <?php
         // ensure the file exists before attempting to read from it
-        $myfile = fopen("posts.txt", "a");
-        fclose($myfile);
+        if (!file_exists("posts.txt")) {
+            $myfile = fopen("posts.txt", "a");
+            fclose($myfile);
+        }
 
         // show content
         $myfile = fopen("posts.txt", "r") or die("Unable to open file!");