By Matt Zandstra

The booklet starts through masking PHP's object-oriented beneficial properties. It introduces key themes together with category statement, inheritance, mirrored image and masses extra. those give you the basics of the PHP's help for gadgets. It additionally introduces a few rules of layout. This version introduces new item correct beneficial properties resembling characteristics, mirrored image extension additions, callable variety hinting, advancements to exception dealing with, and lots of smaller language improvements. the following part is dedicated to layout styles. those describe universal difficulties and their ideas. The part describes the layout rules that make styles robust. It covers some of the vintage layout styles and contains chapters on company and database styles.

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Extra info for PHP Objects, Patterns, and Practice, 4th Edition

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This code works fine, but it has an annoying amount of duplication. I don’t want to have to create boilerplate code like this for every DomainObject child class that I create. How about I push the create() method up to the superclass? abstract class DomainObject { public static function create() { return new self(); } } class User extends DomainObject { } class Document extends DomainObject { } Document::create(); Well, that looks neat. I now have common code in one place, and I’ve used self as a reference to the class.

N"; } } ■■Note Making a method call using parent is the only circumstance in which you should use a static reference to a nonstatic method. Unless you are accessing an overridden method, you should only ever use :: to access a method or property that has been explicitly declared static. In documentation, however, you will often see static syntax used to refer to a method or property. This does not mean that the item in question is necessarily static, just that it belongs to a certain class. The write() method of the ShopProductWriter class might be referred to as ShopProductWriter::write(), for example, even though the write() method is not static.

Self does not refer to the calling context; it refers to the context of resolution. So if I run the previous example, I get this: PHP Fatal error: Cannot instantiate abstract class DomainObject in .... So self resolves to DomainObject, the place where create() is defined, and not to Document, the class on which it was called. 3 this was a serious limitation, which spawned many rather clumsy workarounds. 3 introduced a concept called late static bindings. The most obvious manifestation of this feature is a new keyword: static.

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