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add_meta_box() – Добавляет дополнительные блоки (meta box) на страницы редактирования/создания постов, постоянных страниц или произвольных типов записей в админ-панели.
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How to Add a Fully Functional Custom Meta Box to WordPress Navigation Menus – John Morris
How to Add a Fully Functional Custom Meta Box to WordPress Navigation Menus – John Morris
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