有谁知道如何在PHP中将序数转换为基数？

Question

I know there is a way to make a cardinal numeral into an ordinal. I can use NumberFormmatter::format for this. However, I would like to go the other direction.

Answer 1

The current, (not very good solution in my opinion) is to do the following

function convertOrdinalToCardinal($word) {
  $ordinals = array();
  for ($i=1; $i<=100; $i++) {
    $ordinals[NumberFormatter::format($i, NumberFormatter::ORDINAL)] = $i;
  }
  return $ordinals[$word];
}