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Objects in PHP - Revision

Part 2 of my "PHP revision" for delegates who will be doing substantial project / systems work. (Part 1 [here]).

Object Oriented techniques give programming languages a practical expandability and robsutness as applications written in them grow in size. Code is separated into classes, with each class dealing with a particular type of data and containing the logic to deal with that data. Classes can be tested individually, they can be written so that they only implement appropriate methodology on the data (i.e. only do sensible things), and can be based on one another so that similar types of data handlers can share common logic.

In OO programming, PHP style:

• Define your own data types
• create data elements of your type ("objects") with a special function ("constructor")
• Only provide the functions ("methods") that make sense
• Keep the code in a separate area called a "class" (usually a separate file)
• All data access should be via methods

There's a first really simple revision object program [here] in PHP.

Going a little further:

• Use private, protected and public declarations to enforce access
• Use one class on which to base another to save coding
• Let PHP work out which method to run to save lots of conditionals (Polymorphism)

There's an example showing that [here]

• Design patterns are standardised ways of doing things to make your code consistent and followable
• Static methods are utility functions in the class as a whole
• A common design pattern is a factory method which translates data into objects
• See also the cached design pattern which means we can be more effcient by saving too many recomputes.

See an example of those techniques in use [here].

Our Object Oriented Programming in PHP day covers the above in detail (and much more), and we also revise OO programming in PHP at the start of our PHP Techniques course.
(written 2012-12-16, updated 2012-12-22)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
H108 - Objects in PHP
  [4628] Associative objects - one object within another. - (2016-01-20)
  [4627] Caching results in an object for efficiency - avoiding re-calculation - (2016-01-20)
  [4626] Singleton design pattern - examples and uses - (2016-01-20)
  [4366] Changing what operators do on objects - a comparison across different programming languages - (2014-12-26)
  [4356] Object factories in C++, Python, PHP and Perl - (2014-12-19)
  [4073] Learning about Object Orientation in PHP - a new set of examples - (2013-04-28)
  [4057] stdClass in PHP - using an object rather than an associative array - (2013-04-02)
  [3843] Caching Design Patterns - (2012-08-20)
  [3841] Copying, duplicating, cloning an object in PHP - (2012-08-18)
  [3840] Autoload in PHP - (2012-08-17)
  [3609] How do classes relate to each other? Associated Classes - (2012-02-12)
  [3608] Design Patterns - what are they? Why use them? - (2012-02-12)
  [3607] Designing your application - using UML techniques - (2012-02-11)
  [3211] Computer Graphics in PHP - World (incoming data) to Pixel (screen) conversion - (2011-03-24)
  [3210] Catchable fatal error in PHP ... How to catch, and alternative solutions such as JSON - (2011-03-22)
  [3142] Private and Public - and things between - (2011-01-22)
  [2922] Getting the OO design write - with PHP a example - (2010-08-14)
  [2921] Does copying a variable duplicate the contents? - (2010-08-14)
  [2774] PHP - Object Oriented Design in use - (2010-05-21)
  [2741] What is a factory? - (2010-04-26)
  [2717] The Multiple Inheritance Conundrum, interfaces and mixins - (2010-04-11)
  [2680] Static class members in PHP - a documented example - (2010-03-16)
  [2641] Object Oriented Programming in PHP - (2010-02-19)
  [2632] Shipping a test harness with your class in PHP - (2010-02-12)
  [2435] Serialization - storing and reloading objects - (2009-10-04)
  [2434] Abstract classes, Interfaces, PHP and Java - (2009-10-03)
  [2380] Object Oriented programming - a practical design example - (2009-08-27)
  [2172] PHP4 v PHP5 - Object Model Difference - (2009-05-11)
  [2171] Cleaning up redundant objects - (2009-05-11)
  [2169] When should I use OO techniques? - (2009-05-11)
  [2160] PHP - getclass v instanceof - (2009-05-07)
  [1925] Introduction to Object Oriented Programming - (2008-12-06)
  [1820] Sorting objects in PHP - (2008-10-04)
  [1819] Calling base class constructors - (2008-10-03)
  [1682] Accounts in PHP - an OO demo - (2008-06-19)
  [1535] OO PHP demonstration - comparing objects and more - (2008-02-08)
  [1217] What are factory and singleton classes? - (2007-06-04)
  [1153] Object Oriented Model - a summary of changes from PHP4 to PHP5 - (2007-04-18)
  [1027] Cue the music, I'm happy. - (2007-01-09)
  [836] Build on what you already have with OO - (2006-08-17)
  [720] Planning a hotel refurb - an example of a Gant chart in PHP - (2006-05-14)
  [656] Think about your design even if you don't use full UML - (2006-03-24)
  [485] North, Norther and Northest - PHP 5 Objects - (2005-11-04)
  [421] Don't repeat code - use loops or functions - (2005-08-21)
  [343] Should I use structured or object oriented? - (2005-06-10)
  [205] PHP5 lets you say no - (2005-02-07)
  [124] PHP v Java - (2004-11-20)
  [67] Object Oriented Programming in PHP - (2004-09-29)

H300 - PHP Revision
  [4050] A couple of new fast-start PHP examples - (2013-03-21)
  [3952] PHP revision ... by example. - (2012-12-15)
  [2742] A simple server benchmark script - (2010-04-27)
  [1787] Howto - write and manage a news box on your web page - (2008-09-06)
  [1615] PHP training courses every month - (2008-04-18)


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