Reply To: Disable adding and reducing numbers

• John Huebner

• June 24, 2020 at 11:54 pm

https://www.advancedcustomfields.com/resources/acf-validate_value/

add_filter('acf/validate_value/name=your-field-name', 'validate_text_as_number', 20, 4);
function validate_text_as_number($valid, $value, $field, $input) {
  if ($valid !== true) {
    return $valid;
  }
  if (preg_match('/[^0-9]/', $value) {
    $valid = 'enter only numbers';
  }
  return $valid;
}