PHPを使用してアラビア数字を大文字に変換する方法

function arabicToUpperCase($arabic) { $units = array('','one','two','three','four','five','six','seven','eight','nine'); $teens = array('ten','eleven','twelve','thirteen','fourteen','fifteen','sixteen','seventeen','eighteen','nineteen'); $tens = array('','ten','twenty','thirty','forty','fifty','sixty','seventy','eighty','ninety'); $hundreds = array('','one hundred','two hundred','three hundred','four hundred','five hundred','six hundred','seven hundred','eight hundred','nine hundred'); $thousands = array('','one thousand','two thousand','three thousand','four thousand','five thousand','six thousand','seven thousand','eight thousand','nine thousand'); $parts = explode('.', $arabic); $integer = $parts[0]; if($integer == 0) { return 'zero'; } $digits = str_split($integer); $digits = array_reverse($digits); $result = array(); for($i = 0; $i < count($digits); $i++) { switch($i) { case 0: $result[] = $units[$digits[$i]]; break; case 1: if($digits[$i] == 1) { $result[] = $teens[$digits[$i-1]]; $result[] = $tens[$digits[$i]]; } else { $result[] = $tens[$digits[$i]]; } break; case 2: $result[] = $hundreds[$digits[$i]]; break; case 3: $result[] = $thousands[$digits[$i]]; break; } } $result = array_reverse($result); return join(' ', $result); }

echo arabicToUpperCase('1234567');