If you’re using WordPress to create and manage websites, WordPress plugins are the software that can extend or enhance CMS functionality. This book offers guidance on writing plugins for WordPress sites to share or sell to other users.

Professional WordPress Plugin Development, 2nd Edition

Professional WordPress® Plugin Development

Preface

An Introduction to Plugins

Plugin Framework

Dashboard and Settings

Security and Performance

Hooks

Javascript

Blocks and Gutenberg

Content

Users and User Data

Scheduled Tasks

Internationalization

REST API

Multisite

The Kitchen Sink

Debugging

The Developer Toolbox

A  link, 67 abs() function, 82 absint() function, 332 $abs_rel_path parameter, 262 $accepted_args parameter, 107, 118 access, limiting, 225–228 Accessibility team, 424 action hooks, 106–117 actions, 107–108 activate() method, 22 Active status, for plugins, 10 add_action() function, 107–108, 109, 126, 127, 419 add_blog_option() function, 342 add_cap() function, 230–231 add_filter() function, 118, 119, 120, 122, 126, 127, 419 add_menu_page() function, 32 add_meta_box() function, 188–189 add_network_option() function, 342 add_option() function, 36–37, 41, 42 add_options_page() function, 34–35 add_permastruct() function, 392 add_post_meta() function, 184–185, 186 add_rewrite_rule() function, 389 add_rewrite_tag() function, 392 add_role() function, 228–230 add_settings_error() function, 51 add_settings_field() function, 44–45, 52 add_settings_section() function, 44–45 add_shortcode() function, 325, 327, 359, 367 add_site_meta() function, 343 add_submenu_page() function, 33 add_user_meta() function, 218–219 add_user_to_blog() function, 344, 345 admin bar, 73 admin user, 206, 227–228 Administrator role, 224 admin_menu action hook, 115 admin_url() function, 21 $after parameter, 196 Ajax, 145–146 all‐in‐one methods, 91–93 Angular, 146 anonymous functions, using hooks with, 127–128 Apache, 385, 403 application passwords, 286 apply_filters() function, 117–118, 119, 121, 128 apply_filters_ref_array() function, 121, 128 arbitrary text strings, 82–83 Archived status (Multisite), 316 $args parameter, 106, 117, 183, 193, 226, 236, 240, 287, 295 array_map() function, 89 arrays, 37, 39–40, 89 attachments, 176, 182–183 $attr parameter, 362 attributes, escaping, 85–86 auth_callback argument, 184 authentication, 284–286 Author role, 224 author_can() function, 226 authority, intention vs., 74–75 autoload parameer, 40–42 automatic mapping, 181 

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