The Current Situation Object-Oriented Introduction Basics, concepts, terminology & examples Object-Oriented Benefits Code re-use, portability, structure, meaning, control, separation of responsibility, time, reduce dependencies and more

The Current Situation

Object-Oriented Introduction

Basics, concepts, terminology & examples

Object-Oriented Benefits

Code re-use, portability, structure, meaning, control, separation of responsibility, time, reduce dependencies and more

Most scripts & tutorials all procedural or show bad understanding of OO PHP’s unique history Template language & PHP/FI 2.0 “ evolved” over time with OO features Good OO finally starting to emerge PHP5 released in 2004 Zend Framework Symfony Project

Most scripts & tutorials all procedural or show bad understanding of OO

PHP’s unique history

Template language & PHP/FI 2.0

“ evolved” over time with OO features

Good OO finally starting to emerge

PHP5 released in 2004

Zend Framework

Symfony Project

That was easy! Add “Object-Oriented PHP” to your resume!

It’s much more than just syntax – It’s a mindset Object-Oriented programming gives meaning to your data Represents real-world objects when possible Where have we seen this before?

It’s much more than just syntax – It’s a mindset

Object-Oriented programming gives meaning to your data

Represents real-world objects when possible

Where have we seen this before?

Semantic markup Think: <blockquote> for quotes, not indentation <address> for addresses, not <p> or <div> <cite> instead of <i> for citations Goal is to for code to convey meaning

Semantic markup

Think:

<blockquote> for quotes, not indentation

<address> for addresses, not <p> or <div>

<cite> instead of <i> for citations

Goal is to for code to convey meaning

Create meaning and structure Separate responsibilities Reduce/Isolate dependencies Create common public interfaces Clear, self-documenting code

Create meaning and structure

Separate responsibilities

Reduce/Isolate dependencies

Create common public interfaces

Clear, self-documenting code

Code objects cannot always represent real-world objects Application flow Structure Delegation Separation of responsibilities How do we solve these problems? Design Patterns

Code objects cannot always represent real-world objects

Application flow

Structure

Delegation

Separation of responsibilities

How do we solve these problems?

Design Patterns

Model-View-Controller (MVC) Active Record Data Mapper Adapter Registry Factory Observer

Model-View-Controller (MVC)

Active Record

Data Mapper

Adapter

Registry

Factory

Observer

What OO programming is not – where many PHP projects go wrong

What OO programming is not – where many PHP projects go wrong

Decorator

Decorator

What is User? A finder/utility class? No clear definition or purpose “ bob” is a User 1 instance = 1 user Properties of a user Functions of a user

What is User?

A finder/utility class?

No clear definition or purpose

“ bob” is a User

1 instance = 1 user

Properties of a user

Functions of a user

The power of applying object-oriented design to your application

The power of applying object-oriented design to your application

Objects add automatic clarity Stick to standards and naming conventions camelCase Zend Coding Standards Function naming as verbose as possible getPostBySlug($slug) findPostsWithTag($tagName)

Objects add automatic clarity

Stick to standards and naming conventions

camelCase

Zend Coding Standards

Function naming as verbose as possible

getPostBySlug($slug)

findPostsWithTag($tagName)

Parent > Child relationship between objects Child extends Parent Child inherits all parent methods Child can override parent methods when required Changes can be reflected across your entire application with relative ease

Parent > Child relationship between objects

Child extends Parent

Child inherits all parent methods

Child can override parent methods when required

Changes can be reflected across your entire application with relative ease

Hides actual implementation Reduces or isolates dependencies to lower levels Reduces or eliminates extensive future changes in code base

Hides actual implementation

Reduces or isolates dependencies to lower levels

Reduces or eliminates extensive future changes in code base

Adding extra headers is a mess (CC, BCC) No built-in file attachment options Limited configuration options (Sendmail/SMTP) Very inefficient for large amounts of email

Adding extra headers is a mess (CC, BCC)

No built-in file attachment options

Limited configuration options (Sendmail/SMTP)

Very inefficient for large amounts of email

Custom Email() object Clear, descriptive syntax Unlimited configuration options mail(), SMTP, database, external server, etc. File attachments can be easy with function

Custom Email() object

Clear, descriptive syntax

Unlimited configuration options

mail(), SMTP, database, external server, etc.

File attachments can be easy with function

Did you notice the dependencies?

Remove the database dependencies by using a standard interface PDO provides one (bundled with PHP5) Use dependency injection to expose dependencies

Remove the database dependencies by using a standard interface

PDO provides one (bundled with PHP5)

Use dependency injection to expose dependencies

Pass connection into constructor and store it as a class property Replace mysql_* functions with standard functions from PDO using connection

Database adapters are interchangeable

Interchangeable code components Standard interface Single dependency Separate “engine” from implementation

Interchangeable code components

Standard interface

Single dependency

Separate “engine” from implementation

Different payment processors are a simple drop-in replacement

Objects should serve a single purpose Separate code into manageable chunks MVC – Good example Model – Database View – Display Controller – Request/Flow Resist temptation of globals everywhere “ global $var”, $_SESSION, $_REQUEST, etc

Objects should serve a single purpose

Separate code into manageable chunks

MVC – Good example

Model – Database

View – Display

Controller – Request/Flow

Resist temptation of globals everywhere

“ global $var”, $_SESSION, $_REQUEST, etc

Building a Data Mapper with PHP5 and the Standard PHP Library Friday Oct. 10 @ 10:30am

Building a Data Mapper with PHP5 and the Standard PHP Library

Friday Oct. 10 @ 10:30am

www.php.net/php5 Full official PHP5 feature documentation Communities Sitepoint – sitepoint.com PHPit – phpit.com PHP|Architect – phparch.com Zend Developer Zone - devzone.zend.com

www.php.net/php5

Full official PHP5 feature documentation

Communities

Sitepoint – sitepoint.com

PHPit – phpit.com

PHP|Architect – phparch.com

Zend Developer Zone - devzone.zend.com

Vance Lucas, 23 Blog: www.vancelucas.com Email: [email_address] Making websites since age 12 Started learning PHP when PHP3 was new Oklahoma Baptist University – Shawee Bachelor of Business Administration Currently work at Back40 Design, Inc. www.back40design.com

Vance Lucas, 23

Blog: www.vancelucas.com

Email: [email_address]

Making websites since age 12

Started learning PHP when PHP3 was new

Oklahoma Baptist University – Shawee

Bachelor of Business Administration

Currently work at Back40 Design, Inc.

www.back40design.com