Get ACF field on the different pages?

Problem: How get ACF field on the different pages, e.g. in functions.php?

How to get ACF field on the different pages

Solution: In order to obtain contain ACF field on any pages, including functions.php we should input page ID to as second argument of the ACF function get_field( 'some_field', page_ID ). We'll look at a little bit example when we need get ACF fields in AJAX query. Ok, we should do some simple steps:

Step 1: On the page, on which call AJAX:

<script>
...
var current_page_id = '<?php echo $post->ID; ?>'; // get page ID. If we need get post ID without loop use $wp_query->get_queried_object_id();
... 
</script>

Step 2: in the script for set param AJAX write:

...
var data = {
...
'page_ID'  : current_page_id
};
...

Step 3: in AJAX function in the functions.php write:

...
$page_ID = ( (int)$_POST['page_ID'] );
$example = get_field( 'example', $page_ID );
...

Note: Front Page ID we can get use: get_option( 'page_on_front' )

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