Set Wordpress excerpt and post thumbnail based on custom field - wordpress

Question

As stated in the title, I would like to automatically save/update the value of post_excerpt and post_thumbnail based on an ACF custom field (mostly for compatibily reasons with other plugins). Now, while tring to accomplish this I encountered 2 issues, first being with the following function:
function test_FeaturedImageSetByACF() {
$current_screen = get_current_screen(); // Current admin screen needed to identify the current cpt
$current_cpt_name = $current_screen->post_type; // Current cpt name
$current_cpt_support = 'thumbnail'; // We want to check if the CPT supports this feature
$post_id = get_the_ID(); // Current post ID
$post_image_field = get_field('post_head_img'); // ACF field we want to sync
$post_image_id = $post_image_field['id']; // ACF image filed ID
$post_image_url = $post_image_field['url']; // ACF image filed URL
// If current cpt supports thumbnails/featured images
if ( post_type_supports( $current_cpt_name, $current_cpt_support ) ) {
if ( ( $post_image_url ) AND ( ( $post_image_url ) != ( get_the_post_thumbnail() ) ) ) {
delete_post_thumbnail( $post_id );
set_post_thumbnail( $post_id, $post_image_id );
}
}
}
add_action('save_post', 'test_FeaturedImageSetByACF', 13, 2 );
add_action('publish_post', 'test_FeaturedImageSetByACF', 10, 2 );
It does work, however sometimes it seems to update the value only the second time I save (which means I have to save twice). I understand I'm either using a wrong hook, a wrong priority or something like that, but I can't figure out which one it is.
Second issue I have, is I would like to accomplish something similar for post excerpts. Now the functions's will look alike the previous one quite a lot, but I don't know which value to update. Can anyone point me in the right direction?
Thanks in advance

Answer 1

You can use acf/save_post hook. Object ID is passed
add_action('acf/save_post', 'handle_acf', 20);
function handle_acf($object_id)
{
// Do your stuff
}

Answer 2

Since this became more of an ACF specific question rather than a generic one, I decided to post on ACF's support forums aswell were user John Huebner pointed me in the right direction. For anyone interested, the topic can be found at https://support.advancedcustomfields.com/forums/topic/set-wordpress-excerpt-and-post-thumbnail-based-on-custom-field/ while (in the event that post may get deleted or something) this is the code I used both for the excerpt part and the custom post thumbnail/featured image:
add_action('save_post', 'flex_CustomExcerptSetByACF', 50);
function flex_CustomExcerptSetByACF() {
global $post;
$post_id = ( $post->ID ); // Current post ID
$post_excerpt = get_field( 'post_excerpt', $post_id ); // ACF field
if ( ( $post_id ) AND ( $post_excerpt ) ) {
$post_array = array(
'ID' => $post_id,
'post_excerpt' => $post_excerpt
);
remove_action('save_post', 'flex_CustomExcerptSetByACF', 50); // Unhook this function so it doesn't loop infinitely
wp_update_post( $post_array );
add_action( 'save_post', 'flex_CustomExcerptSetByACF', 50); // Re-hook this function
}
}
add_action('save_post', 'flex_FeaturedImageSetByACF', 50);
function flex_FeaturedImageSetByACF() {
$current_screen = get_current_screen(); // Current admin screen needed to identify the current cpt
$current_cpt_name = $current_screen->post_type; // Current cpt name
$current_cpt_support = 'thumbnail'; // We want to check if the CPT supports this feature
global $post;
$post_id = ( $post->ID ); // Current post ID
$post_image_field = get_field('post_head_img', $post_id ); // ACF field
if ( ( $post_id ) AND ( $post_image_field ) ) {
$post_image_id = $post_image_field['id']; // ACF image filed ID
$post_image_url = $post_image_field['url']; // ACF image filed URL
// If current cpt supports thumbnails/featured images
if ( post_type_supports( $current_cpt_name, $current_cpt_support ) ) {
if ( ( $post_image_url ) AND ( ( $post_image_url ) != ( get_the_post_thumbnail() ) ) ) {
update_post_meta($post_id, '_thumbnail_id', $post_image_id);
}
}
}
}