Download e-book for kindle: PHP Object-Oriented Solutions by David Powers

By David Powers

With the surge of recognition of personal home page five, object-oriented programming is now an enormous attention for Hypertext Preprocessor builders. This version-neutral e-book is a gradual advent to object-oriented programming (OOP) that may not overburden you with complicated thought. It teaches you the basic fundamentals of OOP that you're going to want to know prior to relocating onto a extra complex point, and incorporates a sequence of prepackaged scripts that you should comprise into your current websites with the minimal of effort.

It indicates how object-oriented programming can be utilized to create reusable and conveyable code through strolling you thru a chain of straightforward tasks. The initiatives characteristic the types of items builders run up opposed to each day, and comprise a validator for filtering person enter, an easy Date category that avoids the necessity to keep in mind the entire esoteric structure codes in personal home page, and an XML generator.

  • Teaches the basics of OOP
  • Simple tasks exhibit how OOP suggestions paintings within the genuine global
  • Prepackaged scripts can simply be extra in your personal tasks

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Use the -> operator to access an object’s methods or properties. When accessing a property with the -> operator, omit the $ sign. 32 WRITING PHP CLASSES Attempting to access a protected or private property or method from an external script triggers a fatal error. Use getter and setter methods to access protected and private properties and methods from an external script. In PHP 3 and PHP 4, you could reassign the value of $this to another object. Doing so now causes a fatal error. Since PHP 5, $this refers only to the current object.

You do this in exactly the same way as passing an argument to a function. When you create an instance of a class, PHP automatically looks for the class’s constructor method (or constructor). As the name suggests, a constructor builds the object, applying default values and assigning to properties values passed to the class when an object is instantiated. In many languages, the constructor is a method that shares the same name as the class. This is how PHP objects were built in PHP 3 and 4. However, since PHP 5, the constructor for all classes is called __construct() (with two leading underscores).

However, to use it anywhere inside the class hierarchy, you need to prefix it with the self keyword and the scope resolution operator like this: self::POUNDS_TO_KILOGRAMS With class constants, the self keyword refers to a constant defined not only in the current class but in any ancestor class further up the hierarchy. Because constants don’t change, it can sometimes be useful to use them outside a class. There’s no need to instantiate an object to do so. php in ch2_exercises): class classA { const FIXED_NUMBER = 4; } 46 WRITING PHP CLASSES class classB extends classA { const FIXED_NUMBER = 20; } echo classA::FIXED_NUMBER .

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