Word Press Plugin Development By Nyros Developer

WordPress Plugin Development Presented By Thirupathi.J

Concepts
What is wordpress?
How to install wordpress?
What is wordpress plugin?
What do you need to make a wordpress plugin?
Plugin Structure?
Plugin API?

What is WordPress? WordPress is an open source blog publishing application powered by PHP and MySQL which can also be used for content management. It has many features including a workflow, a plugin architecture and a templating system.

How to install WordPress? Download the wordpress latest version from: http://wordpress.org/download/

What is a WordPress plugin? Little applications used to enhance functionality or add specific functions tailored to a site's specific needs.

Some plugins: Capitalize Titles of Pages and Posts WordPress Database Backup WordPress.com Stats Comment Hilite

What do you need to make a plugin? a problem to solve some PHP knowledge some spare time a test server with your test wordpress (XAMPP is good.) ‏

Plugin Directory Structure
Your Plugin:
/wp-content/plugins/my-plugin
Inside “ my-plugin ”
readme.txt
screenshot-1.png
my-plugin.php
Always put it in a directory!
Uses 'dashes' and not 'underscores'
http://codex.wordpress.org/Writing_a_Plugin#Names.2C_Files.2C_and_Locations

Plugin API - Enabled "hooks" - Extend functionality without editing the core code - Two categories: Actions and Filters

2 Kinds of WordPress Hooks Actions = “Do Something” Filters = “Transform”

Actions Actions are the hooks that the WordPress core launches at specific points during execution, or when specific events occur. Your plugin can specify that one or more of its PHP functions are executed at these points, using the Action API. add_action( 'hook_name', 'your_function_name', [priority], [accepted_args] );

Filters Functions that modify text, lists and various types of information that are used and produced by WordPress. add_filter('hook_name', 'your_filter_function', [priority], [accepted_args]);

Writing Your First Plugin

readme.txt
http://codex.wordpress.org/Writing_a_Plugin#Readme_File
http://wordpress.org/extend/plugins/about/readme.txt
Useful only for publishing to WordPress Plugin Directory Information about your plugin: Description, Installation, Changelog, Donation Links, Tags, etc...

screenshot-1.png
Useful only for publishing to
WordPress Plugin Directory

my-plugin.php
4 parts to a plugin
Plugin Header
Hooks
PHP Code
Template Code

File Structure

Plugin Headers http://codex.wordpress.org/Writing_a_Plugin#Standard_Plugin_Information

Plugin Headers http://codex.wordpress.org/Writing_a_Plugin#Standard_Plugin_Information
Always on top, no choice
Fill in with your own details

Hooks (Filters)

Hooks (Filters)
After plugin headers (my preferance)
Makes it easier to find

PHP Code

Plugin 1 Figure out what you want to do. I want to convert all instances of “WordPress” to “WORDPRESS”in a post's content.

the_content (filter) http://codex.wordpress.org/Plugin_API/Filter_Reference/the_content

add_filter http://codex.wordpress.org/Plugin_API/Filter_Reference/the_content

add_filter http://codex.wordpress.org/Plugin_API#Hook_to_WordPress ② ① Hook Name ② Callback ①

Hook Callback
Determines what PHP function to call
Callback can be either:
String; or
Array of 2 strings (my preference)

Hook Callback
String
Calls a function
Array of 2 strings
Calls a static function in a class

They do the same thing

I Prefer Array Callbacks
Allows me to segment my code
Lower chances of name conflicts
Easily tell which function belongs to which hook

Filters are Transformations filters have to return a transformation

Filter return Values
A filters return value, is the result of the transformation
② ① return ② transformation ① http://php.net/manual/en/function.preg-replace.php

Plugin 2 Figure out what you want to do. I want to BOLD all instances of “WORDPRESS” in a post's content.

Hook Priority http://codex.wordpress.org/Plugin_API#Hook_to_WordPress

Priority ② ② Callback ① ③ ② ② ③ Priority (optional) ① Hook Name http://codex.wordpress.org/Plugin_API#Hook_to_WordPress

Which one goes first? WordPress2WORDPRESS#the_content ABolderWordPress#the_content

Default Priority 10 smaller numbers = higher priority larger numbers = lower priority http://codex.wordpress.org/Plugin_API#Hook_to_WordPress

Therefore Order of execution: (10) WordPress2WORDPRESS#the_content (20) ABolderWordPress#the_content

THANK YOU

Word Press Plugin Development By Nyros Developer

by Nyros Technologies on Jul 20, 2010

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Word Press Plugin Development By Nyros Developer — Presentation Transcript