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Bending WordPress
To Your Will
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No content
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Folder Structure
Headers
Events
Plugin Development
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wp-content/plugins/plugin-slug
> plugin-slug.php
> readme.txt
Folder Structure
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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
*/
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PHP
call_user_func()
WordPress
do_action()
apply_filters()
Events
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do_action( ‘hook’ );
add_action( ‘hook’, ‘my_function’ );
Events: Hooks
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add_action( ‘div_content’, ‘my_content’ );
function my_content() {
echo “Hello world!”;
}
Events: Hooks - Example
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Hello world!
Events: Hooks - Example
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add_action( ‘hook’, ‘my_function’, 10 );
Lower number == higher priority
Events: Priorities
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add_action( ‘hook’, ‘my_function’, 10, 2 );
function my_function ( $foo, $bar ) {
...
}
Events: Parameters
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apply_filters( ‘filter’, $foo );
add_filter( ‘filter’, ‘my_function’ );
Filters must always return a value
Events: Filters
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$v = apply_filters( 'body_class', $classes );
Events: Filters - Example
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add_filter( ‘body_class’, ‘add_my_class’ );
function add_my_class( $classes ) {
$classes[] = ‘my-class’;
return $classes;
}
Events: Filters - Example
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remove_action( ‘hook’, ‘function’ );
remove_filter( ‘filter’, ‘function’ );
Priorities must match original hook/filter
Removing Hooks & Filters
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Bringing it Together
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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
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hugh.blog
@hlashbrooke
automattic.com
make.wordpress.org