advarselsproblem:forventer, at parameter 1 er mysqli_result

mysqli_query() returnerer FALSE hvis der var en fejl i forespørgslen. Så du bør teste for det...

/* Select queries return a resultset */
if ($result = mysqli_query($dbc, "SELECT Name FROM City LIMIT 10")) {
    printf("Select returned %d rows.\n", $result->num_rows);

    /* free result set */
    $result->close();
}

Se dette link for mysqli_query referencehttp://php.net/manual/en/mysqli.query.php