如何使用php从mongodb中选择特定记录

Question

I am using the following code:

foreach ($record as $doc)
{
    $groupIds[] = $doc['groupId'];
}

$gpids = "'".implode("','",array_unique($groupIds))."'";
$collection5 = $db->chat;
$cursor = $collection5->find(array('groupId' => array('$in' => array($gpids))));

foreach($cursor as $res)
{
     print_r($res);
}

but no results will come. Please help me.

Answer 1

That is because your $gpids is a string and you end up putting one element array in the $in query. This should work:

$collection5->find(array('groupId' => array('$in' => array_unique($groupIds))));