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<?php

add_action('acf/render_field_settings/type=number', 'add_readonly_and_disabled_to_number_field');
  function add_readonly_and_disabled_to_text_field($field) {
    acf_render_field_setting( $field, array(
      'label'      => __('Read Only?','acf'),
      'instructions'  => '',
      'type'      => 'radio',
      'name'      => 'readonly',
      'choices'    => array(
        1        => __("Yes",'acf'),
        0        => __("No",'acf'),
      ),
      'layout'  =>  'horizontal',
    ));
    acf_render_field_setting( $field, array(
      'label'      => __('Disabled?','acf'),
      'instructions'  => '',
      'type'      => 'radio',
      'name'      => 'disabled',
      'choices'    => array(
        1        => __("Yes",'acf'),
        0        => __("No",'acf'),
      ),
      'layout'  =>  'horizontal',
    ));
  }