Determines if a post exists based on title, content, date and type.

Saves a draft or manually autosaves for the purpose of showing a post preview.

Returns the list of classes to be used by a meta box.

Redirects to previous page.

Sanitizes POST values from a checkbox taxonomy metabox.

Sanitizes POST values from an input taxonomy metabox.

Renders the hidden form required for the meta boxes form.

Renders the meta boxes forms.

Updates post meta data by meta ID.

Returns whether the post can be edited in the block editor.