how to get the ID the page parent

This should do it:

$page_id = 1; //replace with whatever page id you want to check

$page_data = get_page( $page_id );

$parent_id = $page_data->post_parent; // Get Parent
if( $parent_id != null) {
$page_data = get_page( $parent_id );

$title = $page_data->post_title; // Get Parent title
}

wonderful answer,i just now need the name of the page.that’s what i really need and thanks a lot

I know just how to get the post id but how could we get the page Id? i’m in a real problem ??

This page tells you everything you get back – I think your answer is in there.

get_page

generally, in pages, it is the same as in posts:

$page_id = $post->ID

there might be some ideas in here: https://www.ads-software.com/support/topic/link-to-parent-page?replies=12