Object orientated programming (OOP) is a commonly used term when discussing modern programming techniques. One of the things that makes humans stand out is the ability to categorise - we put objects into categories of similar type of function. For example, we have the category vechicle. Within this category, you have the different types of vehicle - car, bug, train, van. In the same bag, a llama is a type of animal. This analogy applies to programming - we create functions to do specific tasks and then group similar functions into classes. No only does this organise everything, but also allows a common access point for these similar functions.
Hopefully you know what PHP is already. If not I'd better explain it. Right, PHP is a scripting language that you embed in web pages to do advanced stuff. But unlike HTML, PHP is not sent straight to the client to work out it is converted into HTML on the server it is running on and then sent to the client. So this allows you to have a database server set up on your server and you can request records from it whatever way you want! Also because the PHP code is worked out on the server clients are unable to see the PHP code in the page just the outputted HTML!!!
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