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# MongoDB::createCollection

(PECL mongo >=0.9.0)

MongoDB::createCollection — Creates a collection

### Descrição

public MongoCollection MongoDB::createCollection ( string `$name` [, array `$options` ] )

This method is used to create capped collections and other collections requiring special options. It is identical to running:

`<?php
$collection = $db->command(array(
"create" => $name,
"capped" => $options["capped"],
"size" => $options["size"],
"max" => $options["max"],
"autoIndexId" => $options["autoIndexId"],
));
?>`
See MongoDB::command() for more information about database commands.

### Parâmetros

`name`

  The name of the collection.

`options`

  An array containing options for the collections. Each option is its own element in the options array, with the option name listed below being the key of the element. The supported options depend on the MongoDB server version. At the moment, the following options are supported:

  `capped`

    If the collection should be a fixed size.

  `size`

    If the collection is fixed size, its size in bytes.

  `max`

    If the collection is fixed size, the maximum number of elements to store in the collection.

  `autoIndexId`

    If capped is `TRUE` you can specify `FALSE` to disable the automatic index created on the _id field. Before MongoDB 2.2, the default value for autoIndexId was `FALSE`.

### Valor Retornado

Returns a collection object representing the new collection.

### Exemplos

Exemplo #1 MongoDB::createCollection() capped collection example

A capped collection is a special type of collection that has either a fixed or a fixed number of elements. Once the collection is "full," the oldest elements will be removed when new elements are added. Capped collections can be very useful for applications like logging, where you may want to reserve a certain amount of space for logs and not worry about them getting too big.

This example creates a very tiny log collection that will keep a maximum of 10 documents.

`<?php
$log = $db->createCollection(
"logger",
array(
'capped' => true,
'size' => 10*1024,
'max' => 10
)
);
for ($i = 0; $i < 100; $i++) {
$log->insert(array("level" => WARN, "msg" => "sample log message #$i", "ts" => new MongoDate()));
}
$msgs = $log->find();
foreach ($msgs as $msg) {
echo $msg['msg']."\n";
}
?>`

O exemplo acima irá imprimir algo similar à:

sample log message #90
sample log message #91
sample log message #92
sample log message #93
sample log message #94
sample log message #95
sample log message #96
sample log message #97
sample log message #98
sample log message #99

### Changelog

Versão | Descrição
--- | ---
1.4.0 | In versions before 1.4.0, the options were all arguments to the method. The function synopsis in those older versions is: public MongoCollection MongoDB::createCollection ( string `$name` [, bool `$capped` = `FALSE` [, int `$size` = 0 [, int `$max` = 0 ]]] ) The meaning of the options is the same as described under the `options` argument above.

MongoDB::__construct
MongoDB::createDBRef
MongoDB
PHP Manual