HTML number formatting with PHP

Here is my HTML number formatter. Sometimes the browsers wrap the numbers along thousand separator or decimal pont, but this function prevents this event.

function html_number_format($number, $decimals = 2, $dec_point = '.', $thousands_sep = ',') {
  if ($number === FALSE) {
    return '---';
  }
  return '<span style="white-space: nowrap;">'.number_format($number, $decimals, $dec_point, $thousands_sep).'</span>';
}