WordPress at a glance
filter is not described

admin_footer_text filter-hook . WP 2.8.0

Filters the "Thank you" text displayed in the admin footer.

Usage

add_filter( 'admin_footer_text', 'filter_function_name_5147' );
function filter_function_name_5147( $text ){
	// filter...

	return $text;
}
$text(string)
The content that will be printed.

Where the hook is called

In file: /wp-admin/admin-footer.php
admin_footer_text
wp-admin/admin-footer.php 42
echo apply_filters( 'admin_footer_text', '<span id="footer-thankyou">' . $text . '</span>' );

Where the hook is used (in WP core)

Does not used.