MongoCollection::distinct
(PECL mongo >=1.2.11)
MongoCollection::distinct — Retrieve a list of distinct values for the given key across a collection
Descrierea
public MongoCollection::distinct
( string
$key
, array $query = ?
) : array|falseThe distinct command returns a list of distinct values for the given key across a collection.
Parametri
-
key -
The key to use.
-
query -
An optional query parameters
Valorile întoarse
Returns an array of distinct values, sau false în cazul eșecului
Exemple
Example #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);
?>
Exemplul de mai sus va afișa:
array(2) {
[0]=>
int(10010)
[1]=>
int(99701)
}
array(1) {
[0]=>
int(10010)
}
array(2) {
[0]=>
int(10010)
[1]=>
int(99701)
}
Example #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);
?>
Exemplul de mai sus va afișa:
array(2) {
[0]=>
int(25)
[1]=>
int(31)
}
array(0) {
}
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