The document outlines essential information for setting up and managing a WordPress site, including file permissions, configuration, plugins, themes, and various functions like wp_query and custom post types. It also discusses the use of action and filter hooks, shortcodes, and the REST API for data interactions. Additionally, it addresses caching techniques, AJAX functionality, and translation practices in WordPress development.

1. WordPress (4.9.6)
● Go through the standard setup of WordPress
● Do a basic introduction of the admin dashboard

2. WP file permissions
chown www-data:www-data -R * # Let Apache be owner
find . -type d -exec chmod 755 {} ; # Change directory permissions rwxr-xr-x
find . -type f -exec chmod 644 {} ; # Change file permissions rw-r--r--
https://stackoverflow.com/questions/18352682/correct-file-permissions-for-wordpr
ess

3. wp-config.php
if ( file_exists( dirname( __FILE__ ) . '/local-config.php' ) ) {
/** Declare Dev-mode for WordPress */
define( 'WP_LOCAL_DEV', true );
/** Include config for dev environment */
include( dirname( __FILE__ ) . '/local-config.php' );
}
else {
/** Load config from env */
define('DB_NAME', $_ENV['DB_NAME']);
}

4. wp-config.php
● Turn on/off magic using config
● Knowledge of different configs
https://codex.wordpress.org/Editing_wp-config.php

5. WP Plugin
A plugin is a package of code that is used to meet
the custom requirements.
● https://codex.wordpress.org/Plugin_API
● https://codex.wordpress.org/Writing_a_Plugin

6. Plugin Boilerplate
● https://github.com/DevinVinson/WordPress-Plugin
-Boilerplate

7. Start Theme
● WordPress default 2017 theme can be used
● Theme framework can be used if familiar

8. Standard theme signature
Theme Name: WordPress Classic
Theme URI: http://wordpress.org/
Description: The WordPress theme
Author: First Name
Author URI:
Tags: mantle color, variable width, two columns, widgets
Template: use-this-to-define-a-parent-theme
Version: 1.0
General comments/License Statement if any.

9. Theme structure

10. ●

11. WP loop

12. Load JS/CSS in WP
function loadScriptWordPress()
{
// Deregister the included library
wp_deregister_script( 'jquery' );
// Register the library again from Google's CDN
wp_register_script( 'jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js', array(), null,
false );
// Register the script like this for a plugin:
wp_register_script( 'custom-script', plugins_url( '/js/custom-script.js', __FILE__ ), array( 'jquery' ) );
// or
// Register the script like this for a theme:
wp_register_script( 'custom-script', get_template_directory_uri() . '/js/custom-script.js', array( 'jquery' ) );
// For either a plugin or a theme, you can then enqueue the script:
wp_enqueue_script( 'custom-script' );
}
add_action( 'wp_enqueue_scripts', 'loadScriptWordPress' );

13. WP DB ERD

14. When to use WP_query(), query_posts() and
pre_get_posts
● query_posts() don't use query_posts() ever to modify main loop;
● get_posts() returns array of posts, doesn't modify global variables and is safe
to use anywhere;
● WP_Query safe to use anywhere.
https://wordpress.stackexchange.com/questions/1753/when-should-you-use-wp-query-vs-query-posts-vs-get-posts
https://wordpress.stackexchange.com/questions/50761/when-to-use-wp-query-query-posts-and-pre-get-posts

15. When to use WP_query(), $wpdb
● $wpdb when we need to access our own
custom tables
● WP_Query when dealing with the native
WordPress tables.

16. WP DB alter
If we ever need to create or update database table using your
plugin we should use dbDelta
$sql = "CREATE TABLE $table_name (
id mediumint(9) NOT NULL AUTO_INCREMENT,
time datetime DEFAULT '0000-00-00 00:00:00' NOT NULL,
url varchar(55) DEFAULT '' NOT NULL,
PRIMARY KEY (id)
) $charset_collate;";
dbDelta( $sql );
https://codex.wordpress.org/Creating_Tables_with_Plugins

17. WP action hook
● Action hook does not return value
● A way to add custom code to WP core
● Inject content to response buffer
● Modify global variable state

18. WP filter hook
● Filter hook does return value
● Superset of action hook

19. WP shortcodes
● Shortcode is a special kind of content that can be
attached to any WP context and reused
function purchase_subscription( $atts, $content = null) {
$a = shortcode_atts( array('class' => 'green-btn'), $atts );
$content = ($content) ? $content : 'Buy';
return '<span class="'.$a['class'].'">' . $content . '</span>';
}
add_shortcode( 'purchasecode', 'purchase_subscription' );
[purchasecode class="gray-btn"]
[purchasecode class="gray-btn"]Purchase[/purchasecode]

20. WP post type
Default post types
● Post (Post Type: ‘post’)
● Page (Post Type: ‘page’)
● Attachment (Post Type: ‘attachment’)
● Revision (Post Type: ‘revision’)
● Navigation menu (Post Type: ‘nav_menu_item’)
Custom post types
We are allowed to create our own post types if the default post types are not matching with our requirements.
register_post_type( $post_type, $args );
https://codex.wordpress.org/Function_Reference/register_post_type

21. WP REST API
● Simple way to get data in and out of WordPress over HTTP
● A strong replacement for the admin-ajax API
● No PHP dependency, front-end can be anything
Endpoints:
http://<your-domain>/wp-json/wp/v2/posts
https://developer.wordpress.org/rest-api/reference/
Custom endpoints:
https://developer.wordpress.org/rest-api/extending-the-rest-api/adding-custom-end
points/

22. WP cache
● Cache is king on Web
● define('WP_CACHE', true);
● Expires ( GMT formatted date )
● Cache-Control ( public, max-age=60 )
● Etag ( Etag: "1edec-3e3073913b100" )
● Browser caching
● Server caching

23. WP cache
Tools
● https://gtmetrix.com
● https://developers.google.com/speed/pagespeed/insights
Plugins
1. https://wordpress.org/plugins/w3-total-cache/
2. https://wordpress.org/plugins/wp-super-cache/
Rules
3. https://developer.yahoo.com/performance/rules.html?guccounter=1

24. WP ajax
● In WordPress admin side JavaScript global variable ajaxurl can be used as
ajax with proper action
● On front-end we need to make our JavaScript aware of the admin-ajax.php
url.
add_action( 'wp_ajax_my_action', 'my_action' );
add_action( 'wp_ajax_nopriv_my_action', 'my_action' );
function my_action() {
// Do stuff
wp_die();
}
jQuery.post('admin-ajax.php', {'action': 'my_action', 'whatever': 1234}, function(response) {
console.log(response);
});

25. WP taxonomy
Taxonomy stands for grouping things and in WP it is for grouping contents.
Default Taxonomies
● Categropy
● Tag
● Link Category
● Post Formats
WordPress does have Custom Taxonomies

26. WP taxonomy
https://code.tutsplus.com/articles/introducing-wordpress-3-custom-taxonomies--net-11658

27. WP translation
● .pot “portable object template” contains all texts to be translated
● .po “portable object” contains the original text and the translations
● .mo “machine object file for WordPress
● Poedit tools that translates pot file to po and generates mo file
● Text Domain: woocommerce. Show example
● Text domain usage. _e( 'Your Ad here', 'my-text-domain' );
● Talk about translation plugins
https://codex.wordpress.org/I18n_for_WordPress_Developers
https://thethemefoundry.com/blog/translate-a-wordpress-theme/

28. Standard plugins
1. https://wordpress.org/plugins/w3-total-cache/
2. https://wordpress.org/plugins/akismet/
3. https://wordpress.org/plugins/google-sitemap-generator/
4. https://wordpress.org/plugins/contact-form-7/
5. https://wordpress.org/plugins/advanced-custom-fields/
6. https://wordpress.org/plugins/wordpress-seo/
7. https://wordpress.org/plugins/shareaholic/
8. https://wordpress.org/plugins/polylang/

29. Thank you