do_action( "media_upload_{$tab}" )

Fires inside limited and specific upload-tab views in the legacy (pre-3.5.0) media popup.

Description

The dynamic portion of the hook name, $tab, refers to the specific media upload tab. Possible values include ‘library’ (Media Library), or any custom tab registered via the ‘media_upload_tabs’ filter.

Source

File: wp-admin/media-upload.php

View on GitHub

Changelog

Changelog
Version	Description
WP-2.5.0	Introduced.