Slide 1
Slide 1 text
Bending WordPress
To Your Will
Slide 2
Slide 2 text
No content
Slide 3
Slide 3 text
Folder Structure
Headers
Events
Plugin Development
Slide 4
Slide 4 text
wp-content/plugins/plugin-slug
> plugin-slug.php
> readme.txt
Folder Structure
Slide 5
Slide 5 text
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: https://hugh.blog/
* Requires at least: 4.6
* Tested up to: 4.9.8
*
* Text Domain: seriously-simple-podcasting
*/
Slide 6
Slide 6 text
PHP
call_user_func()
WordPress
do_action()
apply_filters()
Events
Slide 7
Slide 7 text
do_action( ‘hook’ );
add_action( ‘hook’, ‘my_function’ );
Events: Hooks
Slide 8
Slide 8 text
Slide 9
Slide 9 text
add_action( ‘div_content’, ‘my_content’ );
function my_content() {
echo “Hello world!”;
}
Events: Hooks - Example
Slide 10
Slide 10 text
Hello world!
Events: Hooks - Example
Slide 11
Slide 11 text
add_action( ‘hook’, ‘my_function’, 10 );
Lower number == higher priority
Events: Priorities
Slide 12
Slide 12 text
add_action( ‘hook’, ‘my_function’, 10, 2 );
function my_function ( $foo, $bar ) {
...
}
Events: Parameters
Slide 13
Slide 13 text
apply_filters( ‘filter’, $foo );
add_filter( ‘filter’, ‘my_function’ );
Filters must always return a value
Events: Filters
Slide 14
Slide 14 text
$v = apply_filters( 'body_class', $classes );
Events: Filters - Example
Slide 15
Slide 15 text
add_filter( ‘body_class’, ‘add_my_class’ );
function add_my_class( $classes ) {
$classes[] = ‘my-class’;
return $classes;
}
Events: Filters - Example
Slide 16
Slide 16 text
remove_action( ‘hook’, ‘function’ );
remove_filter( ‘filter’, ‘function’ );
Priorities must match original hook/filter
Removing Hooks & Filters
Slide 17
Slide 17 text
Bringing it Together
Slide 18
Slide 18 text
Varying Vagrant Vagrants:
varyingvagrantvagrants.org
Plugin Developer Info:
wordpress.org/plugins/developers
Coding Standards:
make.wordpress.org/core/handbook/best-practices/coding-standards
Plugin Template:
github.com/hlashbrooke/WordPress-Plugin-Template
Slide 19
Slide 19 text
hugh.blog
@hlashbrooke
automattic.com
make.wordpress.org