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I've been studying PHP for a while now and decided to dive into OOP. Most of my code was a mess and I've begun to refactor much of the website to OOP; however, I'm having an issue with redundancy in my class functions. Below is a my Tracking.class.php file, which responsible for returning arrays based function and the instance. This is my first time using OOP so I'm unsure if I'm being overly redundant in my child classes, and not entirely sure if there is a way I could clean up my code even more. Any help would be great!

I've been studying PHP for a while now and decided to dive into OOP. Most of my code was a mess and I've begun to refactor much of the website to OOP; however, I'm having an issue with redundancy in my class functions. Below is a my Tracking.class.php file, which is responsible for returning arrays based on the function and the instance. This is my first time using OOP so I'm unsure if I'm being overly redundant in my child classes, and not entirely sure if there is a way I could clean up my code even more. Any help would be great!