MongoDB 支锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟揭猴拷锟斤拷锟阶革拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟揭革拷锟斤拷侄锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟� 锟斤拷锟斤拷1锟斤拷锟斤拷锟斤拷-1锟斤拷锟斤拷锟斤拷锟界：
<?php
$connection = new MongoClient();
$collection = $connection->database->collectionName;
$collection->ensureIndex( array( "i" => 1 ) ); // create index on "i"
$collection->ensureIndex( array( "i" => -1, "j" => 1 ) ); // index on "i" descending, "j" ascending
?>
锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷越锟斤拷越锟襟，达拷锟斤拷锟斤拷锟斤拷锟皆讹拷取锟斤拷锟斤拷锟叫巨达拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟姐不锟剿斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟皆参匡拷 MongoCollection::ensureIndex() 锟侥碉拷锟斤拷 MongoDB 锟斤拷 » MongoDB indexing documentation锟斤拷