Online PHP editor | output for CONmO

<?php function get_field($field, $post_id, $format = true) { return [ 'project_manager' => [33, 9, 21], 'architect' => [], 'contractor' => [17, 16] ][$field]; } function update_field($field, $payload, $post_id, $format = true) { var_export($payload); } function my_acf_save_post_31($post_id) { update_field( 'project_user_select', array_filter([ ...get_field('project_manager', $post_id, false), ...get_field('architect', $post_id, false), ...get_field('contractor', $post_id, false) ]), $post_id ); } my_acf_save_post_31(1);