Update config.php

core/config.php

@@ -24,6 +24,7 @@ $sql = [
 try {
      $con = new PDO("mysql:dbname=".$sql["dbname"].";host=".$sql["host"].";port=".$sql["port"], $sql["user"], $sql["pass"]);
      $con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
+     unset($sql);
 } catch (PDOException $e) {
      die("Connection failed: " . $e->getMessage());
 }