WordPress at a glance
filter is not described

media_upload_form_url filter-hook . WP 2.6.0

Filters the media upload form action URL.

Usage

add_filter( 'media_upload_form_url', 'filter_function_name_8579', 10, 2 );
function filter_function_name_8579( $form_action_url, $type ){
	// filter...

	return $form_action_url;
}
$form_action_url(string)
The media upload form action URL.
$type(string)
The type of media.
Default: 'file'

Changelog

Since 2.6.0 Introduced.

Where the hook is called

media_upload_type_form()
media_upload_form_url
media_upload_type_url_form()
media_upload_form_url
media_upload_gallery_form()
media_upload_form_url
media_upload_library_form()
media_upload_form_url
wp-admin/includes/media.php 2294
$form_action_url = apply_filters( 'media_upload_form_url', $form_action_url, $type );
wp-admin/includes/media.php 2363
$form_action_url = apply_filters( 'media_upload_form_url', $form_action_url, $type );
wp-admin/includes/media.php 2510
$form_action_url = apply_filters( 'media_upload_form_url', $form_action_url, $type );
wp-admin/includes/media.php 2674
$form_action_url = apply_filters( 'media_upload_form_url', $form_action_url, $type );

Where in WP core the hook is used

Usage not found!