Replace deprecated instr function with str_contains and add include/global.php for central configurations.

include/function.inc.php

@@ -1,13 +1,5 @@
 <?php
 
-  function instr($string, $search){
-    if (strpos($string, $search) !== false) {
-      return true;
-    } else {
-      return false;
-    }
-  }
-
   function PostJson($url, $content){
     $curl = curl_init($url);
     curl_setopt($curl, CURLOPT_HEADER, false);