Add hidden input fields to the meta box save form.
filter_block_editor_meta_boxes
Fires right before the meta boxes are rendered.
block_categories
Filter the default array of block categories.
use_block_editor_for_post_type
Filter whether a post is able to be edited in the block editor.
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use_block_editor_for_post
Filter whether a post is able to be edited in the block editor.
redirect_post_location
Filters the post redirect destination URL.
wp_creating_autosave
Fires before an autosave is stored.
post_lock_lost_dialog
Fires inside the dialog displayed when a user has lost the post lock.
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post_locked_dialog
Fires inside the post locked dialog before the buttons are displayed.
override_post_lock
Filters whether to allow the post lock to be overridden.
admin_post_thumbnail_size
Filters the size used to display the post thumbnail image in the ‘Featured image’ meta box.
admin_post_thumbnail_html
Filters the admin post thumbnail HTML markup to return.
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get_sample_permalink_html
Filters the sample permalink HTML markup.
get_sample_permalink
Filters the sample permalink.
postbox_classes_{$screen_id}_{$box_id}
Filters the postbox classes for a specific screen and box ID combo.