One of my favourite features that was introduced in Laravel 5.4 are the higher order collection functions. It allows you to rewrite

collect($models)->filter(function(Model $model) {
   $model->passesFilter();
});

to:

collect($models)->filter->passesFilter();

This works with the filter method an a bunch of other collection methods.

In a new post on his blog Nicola Malizia explains how these methods work under the hood.

A new version of Laravel is available from 24 January 2017 and, as usual, it comes with a lot of new features. Among them, there is one that takes advantage of the dynamic nature of PHP. Some out of there will contempt this, but I find it awesome!

https://unnikked.ga/understanding-laravels-highorder-collections-ee4f65a3029e