September 2016
Intermediate to advanced
270 pages
5h 16m
English
Content preview from Mastering PHP Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chain of Responsibility
Suppose we have a group of objects that together are meant to solve a problem. When one object can't solve a problem, we want the object to send the task to a different object in a given chain. This is what the Chain of Responsibility design pattern is used for.
In order to get this to work, we need a handler, which will be our Chain interface. The various objects in the chain will all implement this Chain interface.
Let's start with a simple example; an associate can purchase an asset for less than $100, a manager can purchase something for less than $500.
Our abstraction for the Purchaser interface looks like this:
<?php interface Purchaser { public function setNextPurchaser(Purchaser $nextPurchaser): bool; public function ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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