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The first step is easy; after all, it’s just a matter of memorization. The second step—the mental leap—is both easy and challenging. Once you take the leap, you’ll no longer think about long lists of tasks that a single script should accomplish; in stead, you’ll see programming as putting together a set of tools to which your script will delegate work. Classes Explained A class is a generic blueprint of something. ” you ask. Well, of just about anything: a car, a customer, a product, a button; any object that’s relevant to the application.
This comes in very handy, as you will see. Creating Objects Now that we know what a class is, it’s time to talk about objects. As we saw earlier in this chapter, an object is the item that’s created or, in object oriented terminology, instantiated, using the class as the blueprint. Thus the object is the actual imple mentation of the class. php Introduction blueprint can be used to build multiple cars. The cars may all be the same make and model, but they’re all driving at different speeds, and have different mileage totals.
MySQL is a popular choice among web hosts that provide support for PHP, and for this reason is typically easier to find than PostgreSQL. This chapter covers all the common operations that PHP developers perform when working with databases: retrieving and modifying data, and searching and backing up the database. To achieve these tasks, we’ll use the built-in PDO extension, rather than database-specific extensions. The examples we’ll work with will use a single table, so no discussion is made of table relationships here.