Laravel Foreach to Collections: Flatten, Filter, Unit Test

Example of refactoring a PHP loop with foreach-if-else structure into a one-liner using Laravel collections, including a unit test that ensure the refactored code still works. Original tweet: https://twitter.com/PovilasKorop/status/1485239396257390595 More Collection Tips: https://github.com/LaravelDaily/laravel-tips/blob/master/Collections.md - - - - - Support the channel by checking out our products: - Enroll in my Laravel courses: https://laraveldaily.teachable.com - Try our Laravel QuickAdminPanel: https://bit.ly/quickadminpanel - Buy my ready-made Laravel scripts: https://laraveldaily.gumroad.com - Purchase my Livewire Kit: https://livewirekit.com - Subscribe to my weekly newsletter: http://bit.ly/laravel-newsletter