WordPress at a glance
action is not described

delete_attachment action-hook . WP 2.0.0

Fires before an attachment is deleted, at the start of wp_delete_attachment().

Usage

add_action( 'delete_attachment', 'action_function_name_1812' );
function action_function_name_1812( $post_id ){
	// action...
}
$post_id(int)
Attachment ID.

Changelog

Since 2.0.0 Introduced.

Where the hook is called

wp_delete_attachment()
delete_attachment
wp-includes/post.php 5419
do_action( 'delete_attachment', $post_id );

Where the hook is used (in WP core)

wp-admin/includes/class-wp-site-icon.php 72
add_action( 'delete_attachment', array( $this, 'delete_attachment_data' ) );
wp-includes/default-filters.php 462
add_action( 'delete_attachment', '_delete_attachment_theme_mod' );