Mongo PHP Helper

mongo.php

<?php

$GLOBALS['__DB'] = false;

function collection($name = FALSE)
{
	if (!$GLOBALS['__DB'])
	{
		$connection = new MongoClient("http://localhost:27017");
		$dbname = "database_name";
		$GLOBALS['__DB'] = $connection->$dbname;
	}
	return $key ? $GLOBALS['__DB']->$key : $GLOBALS['__DB'];
}

function next_id($sequence)
{
	$ret = collection('counters')->findAndModify(
		array('_id' => $sequence . '_id'),
		array('$inc' => array('seq' => 1)),
		null,
		array('new' => true)
	);

	return $ret['seq'];
}

usage.php

<?php

$users = new MongoCollection(collection(), 'users');
$users->ensureIndex(array('email' => 1), array('unique' => true));

$counters = new MongoCollection(collection() 'counters');
$counters->insert(array('_id' => 'user_id', 'seq' => 0));

collection('users')->insert([
  '_id' => next_id('user')
  'text' => 'Hello world'
]);