WordPress Plugin Basics

WordPress Plugin Basics Prepared by Amanda Giles March 2011 [email_address]

What is a Plugin? ,[object Object],[object Object],[object Object]

Why Write a Plugin? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Plugin Basics ,[object Object],[object Object],[object Object],[object Object]

Plugin Header ,[object Object],<?php /* Plugin Name: Header and Footer Plugin URI: http://www.satollo.net/plugins/header-footer Description: Lets you to add code to the head and footer of pages. Author: Satollo Author URI: http://www.satollo.net */ ?>

Plugin License ,[object Object],<?php /* Copyright YEAR PLUGIN_AUTHOR_NAME (email : PLUGIN AUTHOR EMAIL) This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License, version 2, as published by the Free Software Foundation. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ ?>

Plugin Code May Include: ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],Action Hooks add_action(‘hook-name’, ‘function-name’) add_action(‘hook-name’, ‘function-name’, P, N) add_action( 'admin_notices', 'hello_dolly' ); function hello_dolly() { $chosen = hello_dolly_get_lyric(); echo "<p id='dolly'>$chosen</p>"; }

Filter Hooks ,[object Object],[object Object],[object Object],[object Object],[object Object],add_filter(‘hook-name’, ‘function-name’); add_filter(‘hook-name’, ‘function-name’, P, N); add_filter( ‘the_title', ‘star_titles' );

Filter Functions ,[object Object],[object Object],[object Object],add_filter( ‘the_title', ‘star_titles' ); function star_titles($title) { return ‘*** ‘ . $title . ‘ ***’; }

Removing WP Functionality ,[object Object],[object Object],[object Object],[object Object],[object Object]

Changes to WP Admin ,[object Object],[object Object],[object Object],[object Object],add_options_page(‘page_title’,‘menu_title’,‘capability’,’menu-slug’,’function-name’); add_options_page(‘Footer Edit’,‘Footer Edit’,‘manage_options’,’footer-edit’, ’ footer-edit/footer.php’); add_option(‘option_name’,‘option_value’); add_option(‘footer_text’,‘Copyright 2011’); update_option(‘option_name’,‘option_value’); get_option(‘option_name’);

Saving Data ,[object Object],[object Object],add_option(‘first_name’,‘Jane’); add_option(‘middle_name’,‘Ann’); add_option(‘last_name’,‘Smith’); $name_arr = array( “ first_name” => ‘Jane’, “ middle_name” => ‘Ann’, “ last_name” => ‘Smith’); add_option(‘full_name’, $name_arr ); Can be written as What if your plugin requires much more data to be stored in the database???

Creating new database tables ,[object Object],global $wpdb; $table_name = $wpdb->prefix . “contributor_names"; ,[object Object],if($wpdb->get_var("SHOW TABLES LIKE '$table_name'") != $table_name) ,[object Object],$sql = "CREATE TABLE " . $table_name . " ( id mediumint(9) NOT NULL AUTO_INCREMENT, first_name tinytext NOT NULL, middle_name tinytext NOT NULL, last_name tinytext NOT NULL, url VARCHAR(200) NOT NULL, UNIQUE KEY id (id) );"; require_once(ABSPATH . 'wp-admin/includes/upgrade.php'); dbDelta($sql);

Other Considerations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],if ( function_exists ( ' has_term') )

Internationalization ,[object Object],[object Object],[object Object],[object Object],[object Object],_ _(‘string_to_translate’); _ _e(‘string_to_translate’); //Echoed to browser _ _(‘string_to_translate’,‘text_domain’); _ _e(‘string_to_translate’,‘text_domain’); //Echoed to browser

More Information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

WordPress Plugin Basics

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