info/DesignPatternsPHP

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History

Antonio Spinelli 0c774a89e4 create a Test folder for each pattern

2014-05-05 12:02:29 -03:00

..

create a Test folder for each pattern

2014-05-05 12:02:29 -03:00

README.md

start a restructure

2014-03-21 18:03:45 -03:00

User.php

it was created the Behavioral namespace and append its patterns

2014-04-15 22:59:16 -03:00

UserObserver.php

it was created the Behavioral namespace and append its patterns

2014-04-15 22:59:16 -03:00

README.md

Observer

Purpose

To implement a publish/subscribe behaviour to an object, whenever a "Subject" object changes it's state, the attached "Observers" will be notified. It is used to shorten the amount of coupled objects and uses loose coupling instead.

Examples

a message queue system is observed to show the progress of a job in a GUI

Note

PHP already defines two interfaces that can help to implement this pattern: SplObserver and SplSubject.