Getting Started with WordPress Development

WordPress is an incredibly powerful platform and framework for development, but until you learn how to use it you won't be able to make full use of its flexibility. In this session you will learn the core principles of WordPress development that will enable you to start taking full advantage of everything that it offers.

This presentation is aimed at experienced PHP developers who have minimal experience with WordPress development. It was presented at the Cape Town PHP Meetup on 23 April 2015: http://www.meetup.com/Cape-Town-PHP-Group/events/221748419/

The full video of the presentation is available here: https://www.youtube.com/watch?v=JbEgsygOxKU

Transcript

1. Getting Started With WordPress Development
2. HTML PHP MVC WP
5. Folder Structure Headers Events Plugin Development
6. wp-content/plugins/plugin-slug plugin-slug.php readme.txt Folder Structure
7. Headers /* * Plugin Name: Seriously Simple Podcasting * Version: 1.9.6 * Plugin URI: https://wordpress.org/plugins/seriously-simple-podcasting/ * Description: Podcasting the way it's meant to be. * Author: Hugh Lashbrooke * Author URI: http://www.hughlashbrooke.com/ * Requires at least: 4.0 * Tested up to: 4.2 * * Text Domain: seriously-simple-podcasting * Domain Path: /lang/ */
8. PHP call_user_func() WordPress do_action() apply_filters() Events
9. do_action( ‘hook’ ); add_action( ‘hook’, ‘my_function’ ); Events: Hooks
10. add_action( ‘init’, ‘init_function’ ); function init_function() { ... } Events: Hooks
11. add_action( ‘hook’, ‘my_function’, 10 ); Lower number == higher priority Events: Priorities
12. add_action( ‘hook’, ‘my_function’, 10, 2 ); function my_function ( $foo, $bar ) { ... } Events: Parameters
13. apply_filters( ‘filter’, $foo ); add_filter( ‘filter’, ‘my_function’ ); Filters must always return a value Events: Filters
14. add_filter( ‘body_class’, ‘my_function’ ); function my_function( $classes ) { $classes[] = ‘my-class’; return $classes; } Events: Filters
15. remove_action( ‘hook’, ‘function’ ); remove_filter( ‘filter’, ‘function’ ); Priorities must match original hook/filter Removing Hooks & Filters
16. <?php /* * Plugin Name: Google Redirect * Version: 1.0 */ add_action( ‘init’, ‘google_redirect’ ); function google_redirect () { if( isset( $_GET[‘google_redirect’] ) ) { wp_redirect( ‘http://www.google.com’, 302 ); exit; } } ?> Bringing it Together
17. Plugin Developer Info: wordpress.org/plugins/about/ Coding Standards: codex.wordpress.org/WordPress_Coding_Standards Action Reference: codex.wordpress.org/Plugin_API/Action_Reference Plugin Template: github.com/hlashbrooke/WordPress-Plugin-Template Helpful Links
18. wpcapetown.co.za woothemes.com hughlashbrooke.com @hlashbrooke