Adding Custom Meta Boxes to the WordPress Admin Interface — SitePoint
add_meta_box() – Добавляет дополнительные блоки (meta box) на страницы редактирования/создания постов, постоянных страниц или произвольных типов записей в админ-панели.
How to Create Custom WordPress Write/Meta Boxes | Envato Tuts+
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WordPress Meta Boxes – Ultimate Tutorial
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add_meta_box() – Adds a meta box to one or more screens. WP Function.
Writing a wordpress plugin: add_meta_box vs. add_settings_field? - Stack Overflow
How to Add a Fully Functional Custom Meta Box to WordPress Navigation Menus – John Morris
php - How to Save Add meta box woocommerce wordpress - Stack Overflow
add_meta_box() – Adds a meta box to one or more screens. WP Function.
How to Remove Core Meta Boxes/Panels in WordPress Post Edit Screen – Web/ Design/ Vista
Add Meta Box WordPress Custom Post Type - WPLauncher
WordPress Meta Boxes – Ultimate Tutorial
WordPress Metabox Tutorial - add_meta_box() Function
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Using block editor SlotFills to render a meta box – Happy Prime – Custom Web Development
How to Add a Fully Functional Custom Meta Box to WordPress Navigation Menus – John Morris