MySQL Query in PHP doesn't return full result

Question

When I run this:

echo $user_id; // prints 3
$tags_ids_results = $mysqli->query("SELECT TagID FROM UserTagSubscriptions WHERE UserID = $user_id");
while($tag_id_row = $tags_ids_results->fetch_object()) {
    $tag_id = $tag_id_row->TagID;
    echo "In While Loop";
}

This only prints "In While Loop" once. However, when I run the query against the database directly (with the same value of $user_id ), three rows are returned.

UPDATE

When I call fetch_all() on $tags_ids_results , I get a call to undefined method error (I'm on PHP 5.4). I also get NULL when I print out num_row .

Answer 1

原来，我在循环的其余部分中重新声明了$tags_ids_results 。