(PECL mongo >=1.2.11)
MongoCollection::distinct — Retrieve a list of distinct values for the given key across a collection.
$key
[, array $query
] )The distinct command returns a list of distinct values for the given key across a collection.
key
The key to use.
query
An optional query parameters
Returns an array of distinct values, или FALSE
в случае возникновения ошибки
Пример #1 MongoCollection::distinct() example
<?php
$m = new Mongo;
$db = $m->selectDB("test");
$db->dropCollection("distinct");
$c = $db->distinct;
$c->insert(array("stuff" => "bar", "zip-code" => 10010));
$c->insert(array("stuff" => "foo", "zip-code" => 10010));
$c->insert(array("stuff" => "bar", "zip-code" => 99701), array("w" => 1));
$retval = $c->distinct("zip-code");
var_dump($retval);
$retval = $c->distinct("zip-code", array("stuff" => "foo"));
var_dump($retval);
$retval = $c->distinct("zip-code", array("stuff" => "bar"));
var_dump($retval);
?>
Результат выполнения данного примера:
array(2) { [0]=> int(10010) [1]=> int(99701) } array(1) { [0]=> int(10010) } array(2) { [0]=> int(10010) [1]=> int(99701) }
Пример #2 MongoCollection::distinct() example on a embedded document
<?php
$c->insert(array("user" => array("points" => 25)));
$c->insert(array("user" => array("points" => 31)));
$c->insert(array("user" => array("points" => 25)));
$retval = $c->distinct("user.points");
var_dump($retval);
$retval = $c->distinct("user.nonexisting");
var_dump($retval);
?>
Результат выполнения данного примера:
array(2) { [0]=> int(25) [1]=> int(31) } array(0) { }