my first wordpress plugin
TRANSCRIPT
My firstWordPress Plugin
PresentationRoadmap
1. WordPress Introduction
2. Development Paths
3. Plugin Development
Q/A Session
1.WordPress Introduction
What is WordPress?
Evolution of WordPress Platform
▸ WordPress as a Blogging Platform
▸ WordPress as a CMS
▸ WordPress as a Application Platform
And it is continuously evolving each year with new releases.
Websites built on WordPress
Personal Websites
Online Magazines
Company Websites
e-commerce Sites
Custom Applications
It's probably the easiest and most powerful blogging and website content management system (or CMS) in existence today.
Install & Run WordPress
▸ Setup a local Server on your machine▸ WAMP: http://www.wampserver.com/en/▸ XAMPP: https://www.apachefriends.org/index.html
▸ Download WordPress▸ https://wordpress.org/download/
▸ Follow this basic tutorialhttp://www.wpbeginner.com/wp-tutorials/how-to-install-wordpress-on-your-windows-computer-using-wamp/
WordPress Core
Built-in Features
ThemesVisual Design &
Components
PluginsAdditional Features
Themes: https://wordpress.org/themesPlugins: https://wordpress.org/plugins
2.Development Options
What options do we have as
a WP Developer?
Existing Themes1. Themeforesthttp://themeforest.net
2. WordPress.orghttps://wordpress.org/themes
As a non-programmer
Existing Plugins1. WordPress.orghttps://wordpress.org/plugins
2. Codecanyonhttp://codecanyon.net
If you don’t have programming knowledge, you can still create stunning websites using:
As a programmer
If you have basic/good knowledge of PHP, HTML, CSS and JavaScript. You can:
Create new themes Create new plugins
Modify existing themes Modify existing plugins
3.Plugin Development
Let’s develop our
first WP Plugin.
What are Plugins?
Plugins are tools to extend the functionality of WordPress.
Essentially, they are just a collection of functions that can be activated and deactivated together.
WordPress directory structure
Let’s create a very basic plugin
At its simplest, a WordPress plugin is a PHP file with a plugin header comment.
Create a new file /wp-content/plugins/hello-world.php
<?php/** Plugin Name: Hello World Basic*/
https://developer.wordpress.org/plugins/the-basics/header-requirements
How plugins actually work?
By using Hooks, you can tap into WordPress at specific points. (without editing core files)
WordPress Hooks
Hooks are triggered while WordPress run.They are of two types:
ActionsActions allow you to add or changeWordPress functionality
FiltersFilters allow you to filter or change the content as it is loaded.
Common Hooks
Actionsinittemplate_redirectadmin_initafter_setup_themewp_loadedwp_headwp_footeradmin_menu
Filtersthe_contentthe_titlewp_titletemplate_includebody_classpost_class
How hooks are fired?
To fire an Action
It will run all the functions hooked to this action
To fire a Filter:
▸ The $filter_value will be the firstargument of each hooked function
▸ apply_filters will return the filtered input
do_action( 'action_name' );
$filter_value = apply_filters( 'filter_name', $filter_value);
Responding to Hooks
Attach an Action
Attach a Filter:
add_action( 'action_name', 'func_name' );
add_filter( 'filter_name', 'function_name' );
Note!Both take two optional arguments: Priority and Accepted Arguments
We can hook our plugin functions to the core via Actions and Filters.
Add Action
add_action ( 'action_name', ’callback_function_name’,$priority = 10, $accepted_args = 1 )
What is priority?
Actions and filters are executed in the order they are added.
So this code will echo:
function first() {return ”First\n”;
}
function second() {return ”Second\n”;
}
function third() {return ”Third\n”;
}
add_action(‘demo’,’first’);add_action(‘demo’,’second’);add_action(‘demo’,’third’);
do_action(‘demo’);
FirstSecondThird
What is priority? (con..)
Priority changes this order.
Actions and filters have a default priority of 10.Using a lower number gives it higher priority.
Now this code will echo:
function first() {return ”First\n”;
}
function second() {return ”Second\n”;
}
function third() {return ”Third\n”;
}
add_action(‘demo’,’first’);add_action(‘demo’,’second’);add_action(‘demo’,’third’,9);
do_action(‘demo’);
ThirdFirstSecond
Useful Resources (+Free)
▸ If you are WordPress beginner, watch these videosYoutube - Wordpress Basics - For Beginners
▸ If you are new to programming, learn PHP in just 4 hours at Code AcademyLearn to program in PHP
▸ If you want to learn WordPress Plugin Development through videosYoutube - How to build a WordPress Plugin
▸ The best resource for WP Plugin DevelopmentWordPress official guide on Plugin Development
CREDITS
Special thanks to all the people who made and released these awesome resources for free:▸ Presentation template by http://www.slidescarnival.com▸ Content Slides http://www.slideshare.net/johntighe/how-
to-create-your-own-wordpress-plugin▸ Content Slides
http://www.slideshare.net/ylefebvre/workshop-creating-
your-first-wordpress-plugin▸ WordPress official documentation
https://developer.wordpress.org/plugins/intro/