Ошибки:
Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in Z:\home\essens-aktobe\www\view_cat.php on line 70
Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in Z:\home\essens-aktobe\www\view_cat.php on line 107

Код: $result = $link->query("SELECT * FROM table_product WHERE visible='1' $querycat");

$result->num_rows;

{
(70) $row = mysqli_fetch_array($result);
do {
echo('

...

');
}
(107) while ($row = mysqli_fetch_array($result));
}
?>