## mark a section (Learn more)

<?php function numToStr($number) { $numMap = array( 1 => 'One', 2 => 'Two', 3 => 'Three', 4 => 'Four', 5 => 'Five', 6 => 'Six', 7 => 'Seven', 8 => 'Eight', 9 => 'Nine', 10 => 'Ten', 11 => 'Eleven', 12 => 'Twelve', 13 => 'Thirteen', 14 => 'Fourteen', 15 => 'Fifteen', 16 => 'Sixteen', 17 => 'Seventeen', 18 => 'Eigthteen', 19 => 'Nineteen', 20 => 'Twenty', 30 => 'Thirty', 40 => 'Forty', 50 => 'Fifty', 60 => 'Sixty', 70 => 'Seventy', 80 => 'Eighty', 90 => 'Ninety' ); if($number <= 20) { return $numMap[$number]; } else if($number > 20 && $number < 100) { return $numMap[substr($number, 0, 1) . 0] . ' ' . $numMap[substr($number, -1)]; } else { // add algorithm to deal with big numbers... } } ?>

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