WordPress at a glance
function is not described

media_upload_header() WP 2.5.0

Outputs the legacy media upload header.

No Hooks.

Return

Nothing (null).

Usage

media_upload_header();

Code of media upload header: wp-admin/includes/media.php VER 5.0.3

<?php
function media_upload_header() {
	$post_id = isset( $_REQUEST['post_id'] ) ? intval( $_REQUEST['post_id'] ) : 0;

	echo '<script type="text/javascript">post_id = ' . $post_id . ';</script>';
	if ( empty( $_GET['chromeless'] ) ) {
		echo '<div id="media-upload-header">';
		the_media_upload_tabs();
		echo '</div>';
	}
}