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# MongoCollection::distinct

(PECL mongo >=1.2.11)

MongoCollection::distinct — Retrieve a list of distinct values for the given key across a collection.

### Descrição

public array MongoCollection::distinct ( string `$key` [, array `$query` ] )

The distinct command returns a list of distinct values for the given key across a collection.

### Parâmetros

`key`

  The key to use.

`query`

  An optional query parameters

### Valor Retornado

Returns an array of distinct values, ou `FALSE` em caso de falha

### Exemplos

Exemplo #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);
?>`

O exemplo acima irá imprimir:

    array(2) {
      [0]=>
      int(10010)
      [1]=>
      int(99701)
    }
    array(1) {
      [0]=>
      int(10010)
    }
    array(2) {
      [0]=>
      int(10010)
      [1]=>
      int(99701)
    }

Exemplo #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);
?>`

O exemplo acima irá imprimir:

    array(2) {
      [0]=>
      int(25)
      [1]=>
      int(31)
    }
    array(0) {
    }

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