MongoDB & PHP NOTE

1. http://docs.doctrine-project.org/projects/doctrine-mongodb-odm/en/latest/reference/query-builder-api.html

2. http://docs.mongodb.org/manual/reference/operator/#AdvancedQueries-JavascriptExpressionsand%7B%7B%24where%7D%7D

3. http://docs.doctrine-project.org/projects/doctrine-mongodb-odm/en/latest/reference/annotations-reference.html#increment

4. http://api.mongodb.org/perl/current/MongoDB/DataTypes.html#Numbers

5. http://docs.doctrine-project.org/projects/doctrine-mongodb-odm/en/latest/index.html

6. http://blog.servergrove.com/2010/04/28/mongodb-with-php-and-symfony/

7.