Bending WordPress to your Will

by Hugh Lashbrooke

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Bending WordPress To Your Will

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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: http://www.hughlashbrooke.com/ * Requires at least: 4.0 * Tested up to: 4.2 * * Text Domain: seriously-simple-podcasting * Domain Path: /lang/ */

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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( ‘init’, ‘init_function’ ); function init_function() { ... } Events: Hooks

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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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add_filter( ‘body_class’, ‘my_function’ ); function my_function( $classes ) { $classes[] = ‘my-class’; return $classes; } Events: Filters

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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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Plugin Developer Info: wordpress.org/plugins/developers/ 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