Securing php api to use in android application

Question

I am newbie to android development. I am using android studio for developing an application. Things i have done

1. Created a DB with two ta

Answer 1

I will simply say, 

If you already using PHP OPP, then no need to go with any framework. It will be time consuming for you. 
Solution is: "Use remember_token system as like laravel and yii. Authenticate to each method before filter."

If you are using Core PHP. Try same code and include it before filter each method in your api