Free course on freeCodeCamp
freeCodeCamp's Learn Laravel by Building a Medium Clone is a free project-based course where you build a full Medium-like blogging platform using Laravel, PHP's most popular web framework. You learn Laravel's routing, authentication, database relationships, and more through building a real application. The entire course is free on freeCodeCamp.org. After finishing, you can build database-backed web applications with Laravel and understand how modern PHP development works. The main limitation: this assumes you know PHP basics. If you're new to PHP, take freeCodeCamp's PHP Handbook first.
Laravel is PHP's most-installed framework, with over 470 million installs recorded on Packagist and more GitHub stars than any other PHP framework (source: packagist.org/packages/laravel/framework).
freeCodeCamp's in-depth Laravel course by The Codeholic. Takes you from setting up your Laravel environment to building a complete Medium-style blogging platform: routing, Eloquent ORM, Blade templates, authentication, and deployment. Free on YouTube.
PHPBeginner
freeCodeCamp's free PHP handbook by Flavio Copes. A complete written introduction to PHP: syntax, control flow, functions, arrays, OOP, and working with databases. A solid foundation in one of the web's most widely-deployed server languages.