2. Who am i ?
• Tech Blogger http://mahtonu.wordpress.com
• Hacker, Community activist, FOSS advocate
• Works atVantage Labs Dhaka
• @mahtonu
• Authored the title “PHP Application
Development with NetBeans: Beginner's
Guide” http://link.packtpub.com/6HaElo
3. Inside scoop!
• What is Plugin?
• Popular Plugins
• Creating a Plugin from Scratch
• Sanity Practices and a Plugin foundation
• Activation, Deactivation Hooks
• Hooks: Actions and Filters
• Shortcodes
• Resources for Plugin Developer
4. WordPress Plugins allow easy modification,
customization, and enhancement to a
WordPress website.
5. Instead of changing the core programming
of WordPress, you can add functionality
with WordPress Plugins.
6. Book’s Definition
A WordPress Plugin is a program, or a set of
one or more functions, written in the PHP
scripting language, that adds a specific set of
features or services to the WordPress
weblog, which can be seamlessly integrated
with the weblog using access points and
methods provided by the WordPress Plugin
Application Program Interface (API).
26. Things to remember
• A unique descriptive name
• Naming: my-plugin.php or /my-plugin/ folder
• Readme.txt format for wordpress.org/
extend/plugins
• Plugin home page
• File headers (very important!)
30. Parameters
• Plugin URI – is used to let users know about the details of the plugin and
available download options.This isn’t mandatory and you can keep it blank, if
you don’t have an intention of making the plugin publicly available.
• Description – is used to provide a summary of functionality of the plugin.
• Version – is used to define the version and you can use any numbering
format as you wish. Plugins need be upgraded with each WordPress version
upgrade.Therefore it’s good to have proper version numbering even though
it’s not mandatory.
• Author and Author URI – is used to provide details about the
developer of the plugin.
• License – is used to define the conditions for using this plugin.We can
include standard licence such as GPL2 or just mention something we prefer
such as Free to use.
31. Plugin Api
• Enabled “hooks”
• Extend functionality without editing the
core code
• Two categories:Actions and Filters
33. WordPress Plugin Activation
and Deactivation Hooks
function my_slider_activation() {
}
register_activation_hook(__FILE__,
'my_slider_activation');
function my_slider_deactivation() {
}
register_deactivation_hook(__FILE__,
'my_slider_deactivation');
34. Why Do We Use Activation/
Deactivation Hooks
• Create custom database tables on
activation to store data and remove tables
on deactivation.
• Create custom options for plugins and
activation and reset in deactivation.
• Validate other dependent plugin on
activation.
• Any other necessary task you need to
execute in activation.
35. Actions
Specific points in the WordPress code that
can be used to trigger plugin-specified events
and functions
add_action( 'hook_name', 'your_function_name',
[priority], [accepted_args] );
36. Sample action: “wp_login”
function notify_on_login() {
// your code here
// email to admin, etc...
}
add_action('wp_login', 'notify_on_login');
37. 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]);
38. Sample filter: “the_content”
function add_rss_invite() {
// output to screen the link to RSS feed
// if 1st time visitor
}
add_filter('the_content', 'add_rss_invite');
39. Understanding the
Components of Slider
• jQuery library
• jQuery plugin file
• Initialization code
• CSS files used for plugin
• HTML or Images used for sliding
43. Including Scripts : my-slider.php
• wp_enqueue_script is used to include the script file to the
HTML document
• wp_register_script is used to register a script file into
WordPress
• plugins_url function will provide the URL of the plugin
folder.
• SlidesJs core plugin file is named as jquery.slides.min.js
• The initialization part of the library inside
slidesjs.initialize.js jQuery(function() {
jQuery('#slides').slidesjs({
width: 940,
height: 528,
navigation: false
});
});
49. Take away
• Plugin Creation Basics
• Sample Plugin Created from Scratch
• Best Practices
• Hooks:Activation & Deactivation,
Actions & Filters
• Shortcodes: Usage and Creation
50. What should be my next
Steps?
• Template Tags
• Data Saving, Add/Update Options
• Internationalization
• Submit Plugin to Repository
• Admin:Add to admin menu, Control
settings from Dashboard
• Earn Money!!!
52. Resources
• Writing a Plugin: http://codex.wordpress.org/Writing_a_Plugin
• Articles and resources for Plugin developers: https://
codex.wordpress.org/Plugin_Resources
• basics about how WordPress Plugins are written: https://
codex.wordpress.org/Plugins#Default_Plugins
• Plugin API http://codex.wordpress.org/Plugin_API
• Plugin API / Action Reference http://codex.wordpress.org/
Plugin_API/Action_Reference
• Plugin API / Filter Reference http://codex.wordpress.org/