reverted PHP version thet works with MySQL 5.7

html/checknewuser.php

@@ -21,6 +21,7 @@ function checknewuser($user) {
     require_once("opendb.php");
     $dbuser = $db->real_escape_string($user);
     $q = $db->query("select * from user where name='$dbuser';");
+    if (!$q) error("server database error: ".$db->error);
     if ($q->num_rows==0) {
       echo json_encode($user);
     } else {
@@ -31,4 +32,4 @@ function checknewuser($user) {
   }
 }
 checknewuser($_REQUEST['user']);
-?>
+?>