Using the PHP Library for MongoDB (PHPLIB)
After the initial extension set-up, we will continue explaining how to get started with the corresponding userland library to write our first project.
Installing the PHP Library with Composer
The last thing we still need to install to get started on the application itself, is the PHP library.
The library needs to be installed with » Composer, a package manager for PHP. Instructions for installing Composer on various platforms may be found on its website.
Install the library by running:
$ composer require mongodb/mongodb
It will output something akin to:
./composer.json has been created
Loading composer repositories with package information
Updating dependencies (including require-dev)
- Installing mongodb/mongodb (1.0.0)
Downloading: 100%
Writing lock file
Generating autoload files
Composer will create several files: composer.json,
composer.lock, and a vendor directory that will
contain the library and any other dependencies your project might require.
Using the PHP Library
In addition to managing your dependencies, Composer will also provide you with an autoloader (for those dependencies' classes). Ensure that it is included at the start of your script or in your application's bootstrap code:
<?php
// This path should point to Composer's autoloader
require 'vendor/autoload.php';With this done, you can now use any of the functionality as described in the » library documentation.
If you have used MongoDB drivers in other languages, the library's API should look familiar. It contains a » Client class for connecting to MongoDB, a » Database class for database-level operations (e.g. commands, collection management), and a » Collection class for collection-level operations (e.g. » CRUD methods, index management).
As an example, this is how you insert a document into the beers collection of the demo database:
<?php
require 'vendor/autoload.php'; // include Composer's autoloader
$client = new MongoDB\Client("mongodb://localhost:27017");
$collection = $client->demo->beers;
$result = $collection->insertOne( [ 'name' => 'Hinterland', 'brewery' => 'BrewDog' ] );
echo "Inserted with Object ID '{$result->getInsertedId()}'";
?>
Since the inserted document did not contain an _id field, the
extension will generate an MongoDB\BSON\ObjectId for
the server to use as the _id. This value is also made available
to the caller via the result object returned by the insertOne
method.
After insertion, you can query for the data that you have just inserted.
For that, you use the find method, which returns an iterable
cursor:
<?php
require 'vendor/autoload.php'; // include Composer's autoloader
$client = new MongoDB\Client("mongodb://localhost:27017");
$collection = $client->demo->beers;
$result = $collection->find( [ 'name' => 'Hinterland', 'brewery' => 'BrewDog' ] );
foreach ($result as $entry) {
echo $entry['_id'], ': ', $entry['name'], "\n";
}
?>
While it may not be apparent in the examples, BSON documents and arrays are
unserialized as special classes in the library by default. These classes
extend ArrayObject for usability and implement the
extension's MongoDB\BSON\Serializable and
MongoDB\BSON\Unserializable interfaces to
ensure that values preserve their type when serialized back into BSON. This
avoids a caveat in the legacy mongo extension where arrays
might turn into documents, and vice versa. See the
Persisting Data specification for more information on
how values are converted between PHP and BSON.
User Contributed Notes 7 notes
Well most of the tutorials didn't explained well, So i hope this might help someone
Note: this is a part of my laravel project
//getting data from a collection
<?php
use MongoDB\Client as Mongo;
$user = "admin";
$pwd = 'password';
$mongo = new Mongo("mongodb://${user}:${pwd}@127.0.0.1:27017");
$collection = $mongo->db_name->collection;
$result = $collection->find()->toArray();
print_r($result);
?>When your database name contains a "-" (e.g. database-name) you need to use a string instead.
<?php
$client = new MongoDB\Client("mongodb://ip_address:port");
$collection = $client->{'database-name'}->collection;
?>If you have a number of JSON documents with nested elements such as 'responseId' below and you want to know how many documents have a responseId:
{"result":{"responseId":"xyz"}}
{"result":NULL}
{"result":{"responseId":"abc"}}
I was not having luck with the following format
<?php
// trying to get the count of documents where responseId is not equal to NULL (did not work for me)
$intCount = $collection->count(['result' => ['responseId' => ['$ne' => NULL]]]);
?>
Instead I needed to use a period between the JSON elements:
<?php
// get the count of documents where responseId is not equal to NULL
$intCount = $collection->count(['result.responseId' => ['$ne' => NULL]]);
?>To test your connection string, you can do something like this:
<?php
$mongo = new MongoDB\Client('mongodb://my_server_does_not_exist_here:27017');
try
{
$dbs = $mongo->listDatabases();
}
catch (MongoDB\Driver\Exception\ConnectionTimeoutException $e)
{
// PHP cannot find a MongoDB server using the MongoDB connection string specified
// do something here
}
?>Do a text search on the collection with projection
$search['$text'] = ['$search' => "foo"];
$options["projection"] = ['score' => ['$meta' => "textScore"]];
$options["sort"] = ["score" => ['$meta' => "textScore"]];
$cursor = $collection->find($search, $options);Pecl MongoDB at time of writing can be installed (see phpinfo()) but composer will complain that it's not present.
$ composer require "mongodb/mongodb=^1.0.0"
...
Your requirements could not be resolved to an installable set of packages.
If you see this try
$ composer require "mongodb/mongodb=^1.0.0" --ignore-platform-reqsOne question that was unanswered was how to handle insertion of a full JSON document provided as an argument (or in a string variable). The mongodb extension can handle this by simply using json_decode() to convert the JSON document to an object that can then be easily inserted, e.g. (with full document provided as the 2nd command-line argument)
<?php
/* include libmongo API */
require "vendor/autoload.php";
/* include connection string, db and collection values */
require __DIR__ . '/site/db-mongo-inc.php';
/* use MongoDBClient; */
use MongoDB\Client;
/* connection string */
$uri = "mongodb://$user:$pass@localhost";
/* attempt connection to database with $uri */
$client = new MongoDB\Client("$uri");
if (!isset($client)) {
echo 'error: connection failed';
}
/* define collection of documents */
$collection = $client->$db->$collection;
/* insert JSON document from string variable (here $argv[2]) */
if ($argc > 2) {
$jsobj = json_decode ($argv[2]);
if ($jsobj) {
$iresult = $collection->insertOne ( $jsobj );
if (!$iresult) {
printf ("error: insert of object failed.\n");
}
}
}
?>
The extension's block insert feature recursively resolves all field and data values contained in the object and inserts the entire document in the collection. It is helpful to remove the "_id:" field and have that auto-generated for you to avoid issues.