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admin_footer-(hookname) is triggered at the end of the <body> section of a specific admin page, after `admin_footer` and `admin_print_footer_scripts` actions.
The hookname part you can get using the variable $GLOBALS['hook_suffix']. Examples of actions:
add_action('admin_footer-edit.php', 'my_post_list_page_hook'); // Fired on the page with the posts table
add_action('admin_footer-post.php', 'my_post_edit_page_hook'); // Fired on post edit page
add_action('admin_footer-post-new.php', 'my_new_post_page_hook'); // Fired on add new post page
This hook provides no parameters. You use this hook by having your function echo output to the browser, or by having it perform background tasks. Your functions shouldn't return, and shouldn't take any parameters.
Show a paragraph in footer of post edit page
add_action( 'admin_footer-post.php', 'my_post_edit_page_footer' );
function my_post_edit_page_footer(){
echo "<p>This paragraph will be shown in footer of the post edit page.</p>";
}