Get all ACF fields and their sub fields for a given page id

acf-fields-list.php

<?php 
function get_all_acf_fields_and_subfields($page_id) {
    $all_fields = [];

    // Get all field groups associated with the page
    $field_groups = acf_get_field_groups(['post_id' => $page_id]);


    if ($field_groups) {
        foreach ($field_groups as $field_group) {
            $fields = acf_get_fields($field_group['key']);


            if ($fields) {
                foreach ($fields as $field) {
                    $field_data = [
                        'name' => $field['name'],
                        'label' => $field['label'],
                        'key' => $field['key'],
                        'type' => $field['type'],
                        'value' => get_field($field['name'], $page_id),
                    ];

                    // Handle sub fields (repeaters, flexible content, etc.)
                    if (in_array($field['type'], ['repeater', 'flexible_content', 'group'])) {
                        $field_data['sub_fields'] = get_sub_fields_recursive( $field, $page_id);
                    }

                    $all_fields[] = $field_data;
                }
            }
        }
    }

    return $all_fields;
}


function get_sub_fields_recursive($field, $page_id) {
    $sub_fields_data = [];
     if (have_rows($field['name'], $page_id)) {
          while(have_rows($field['name'], $page_id)) {
              the_row();
              foreach ($field['sub_fields'] as $sub_field) {
                    $sub_field_data = [
                      'name' => $sub_field['name'],
                      'label' => $sub_field['label'],
                      'key' => $sub_field['key'],
                      'type' => $sub_field['type'],
                      'value' => get_sub_field($sub_field['name']),  // No $page_id here, inside the loop.
                    ];
                  if (in_array($sub_field['type'], ['repeater', 'flexible_content', 'group'])) {
                    $sub_field_data['sub_fields'] = get_sub_fields_recursive($sub_field, $page_id); //recursive call
                  }
                   $sub_fields_data[] = $sub_field_data;

                }

            }

      }
      return $sub_fields_data;


}





// Example usage:
$acf_fields = get_all_acf_fields_and_subfields($page_id);

// Now you can loop through $acf_fields and access all fields and subfields.
echo '<pre>'; print_r($acf_fields); echo '</pre>';