(PECL mongo >=0.9.0)
MongoCollection::createDBRef — 锟斤拷锟斤拷一锟斤拷锟斤拷锟捷匡拷锟斤拷锟斤拷
document_or_id
If an array or object is given, its _id field will be used as the reference ID. If a MongoId or scalar is given, it will be used as the reference ID.
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锟斤拷锟斤拷峁╋拷瞬锟斤拷锟斤拷锟� _id 锟街段碉拷锟斤拷锟介当锟斤拷 document_or_id 锟斤拷锟斤拷锟斤拷锟斤拷锟结返锟斤拷 NULL锟斤拷
Example #1 MongoCollection::createDBRef() 锟斤拷锟斤拷
<?php
$songs = $db->songs;
$playlists = $db->playlists;
// 为 song 锟斤拷锟斤拷锟斤拷锟斤拷
$manamana = $songs->findOne(array('title' => 'Ma na ma na'));
$refToSong = $songs->createDBRef($manamana);
// 锟斤拷锟斤拷锟斤拷玫锟斤拷业牟锟斤拷锟斤拷斜锟�
$playlists->update(array('username' => 'me'), array('$push' => array('songlist' => $refToSong)));
?>