Populate ACF Select Field with Gravity Forms

acf_select_gravity_forms.php

<?php

function populate_gravity_forms($field) {

  echo '<h1>acf/load_field filter debug within populate_gravity_forms()</h1>';

  if(class_exists('RGFormsModel')) {
    $forms_array = array();
    $forms = RGFormsModel::get_forms(null, 'title');
    foreach($forms as $form) {
      $forms_array[$form->id] = $form->title;
    }
    $field['choices'] = $forms_array;
  }
  return $field;
}
add_filter('acf/load_field/name=subscribe-form-header', 'populate_gravity_forms');
add_filter('acf/load_field/name=subscribe-form-header-tablet', 'populate_gravity_forms');
add_filter('acf/load_field/name=subscribe-form-footer', 'populate_gravity_forms');
add_filter('acf/load_field/name=contact-form', 'populate_gravity_forms');
add_filter('acf/load_field/name=the-popup-form', 'populate_gravity_forms');