perf/type-validation
Allows to check if a variable is of the expected type, using a type specification string like the ones in PHPDoc blocks (int, \Foo\Bar[], null|string, etc).
时间：2015-05-12 02:41
adammbalogh/key-value-store-null
Key-value null store package. It literally does nothing.
时间：2014-10-10 16:59
deviantintegral/null-date-time
Interfaces and classes supporting empty or null DateTime objects
时间：未知
dyrynda/laravel-nullable-fields
This trait allows you to easily flag attributes that should be set as null when being persisted to the database using the Laravel PHP Framework.
时间：未知