public function getAdmins()

class FileLogger implements Logger

class Circle extends Shape public function area($radius) return pi() * pow($radius, 2);

Before you can start to understand classic PHP OOP software design patterns, you must first understand four key principles of OOP:

The series emphasizes that modern OOP is useless without . Jeffrey shows you how to use native PHP types ( string , int , array , callable , and custom objects) to make your code self-documenting.

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