I would say convert POST forms to JSON and JSON to mySQL datasets, and mySQL datasets to JSON. This at least allows you to create API end points.
I would look at Laravel framework. Personally not a fan but there is a large user base and plenty of work in it.
Learn OOP PHP. It is a good into to OOP in general and will help if you want to switch to C# or Java.
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I would say convert POST forms to JSON and JSON to mySQL datasets, and mySQL datasets to JSON. This at least allows you to create API end points.
I would look at Laravel framework. Personally not a fan but there is a large user base and plenty of work in it.
Learn OOP PHP. It is a good into to OOP in general and will help if you want to switch to C# or Java.