8a893068ce
These constants are available since PHP 5.4 and since we're requiring PHP 7.1 there's no reason to require them. I've also simplified the `array_map()` call since it's useless to define a closure that simply calls a function.
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Doctrine 2 is an object-relational mapper (ORM) for PHP 7.0+ that provides transparent persistence for PHP objects. It sits on top of a powerful database abstraction layer (DBAL). One of its key features is the option to write database queries in a proprietary object oriented SQL dialect called Doctrine Query Language (DQL), inspired by Hibernate's HQL. This provides developers with a powerful alternative to SQL that maintains flexibility without requiring unnecessary code duplication.