How to auto post to facebook page?

Have you studied the SDK? https://developers.facebook.com/docs/reference/php/ That and or other Facebook documentation.

I've been reading this: https://adamboother.com/blog/automatically-posting-to-a-facebook-page-using-the-facebook-sdk-v5-for-php-facebook-api/

And this one: https://blog.damirmiladinov.com/php/getting-page-access-token-and-posting-on-facebook-page-with-php.html#.WZeTEz7yjtQ

Also, I'm studying this package: https://github.com/SammyK/LaravelFacebookSdk

You don't need any SDK in order to post to you page. Head over here : https://developers.facebook.com/docs/pages/publishing

You will need a few things:

• FACEBOOK_PAGE_TOKEN
• FACEBOOK_PAGE_ID (this can be found if you go to your page and click on about and scroll all the way to the bottom) (or you can paste your page URL here: https://findmyfbid.com/)
• Guzzle HTTP or Adam's Zttp

There is a very nice Facebook tool called Graph API Explorer here you get find everything and how to access your tokens and post to your https://developers.facebook.com/tools/explorer/

Then you hit a POST request here:

https://graph.facebook.com/v2.11/<YOUR_PAGE_ID>/feed?access_token=<YOUR_PAGE_ACCESS_TOKEN>&message=<YOUR_MESSAGE>&link=<YOUR_LINK>