Using WordPress ‘media_upload_form_handler()’ PHP function
Learn how to use the WordPress'media_upload_form_handler' function to handle form submissions for the legacy media uploader
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Using WordPress ‘media_handle_sideload()’ PHP function
Handles a side-loaded file in the same way as an uploaded file is handled by media_handle_upload() .
Using WordPress ‘maybe_create_table()’ PHP function
Creates a table in the database, if it doesn’t already exist.
Using WordPress ‘map_deep()’ PHP function
Maps a function to all non-iterable elements of an array or an object.