带goto的PHP数字大小写

<?php
$num = 12345;
$words = "";

// 将数字转换为对应的大小写形式
goto start;
one:
$words .= "一";
goto end;
two:
$words .= "二";
goto end;
three:
$words .= "三";
goto end;
four:
$words .= "四";
goto end;
five:
$words .= "五";
goto end;
six:
$words .= "六";
goto end;
seven:
$words .= "七";
goto end;
eight:
$words .= "八";
goto end;
nine:
$words .= "九";
goto end;
ten:
$words .= "十";
goto end;
eleven:
$words .= "十一";
goto end;
twelve:
$words .= "十二";
goto end;
thirteen:
$words .= "十三";
goto end;
fourteen:
$words .= "十四";
goto end;
fifteen:
$words .= "十五";
goto end;
sixteen:
$words .= "十六";
goto end;
seventeen:
$words .= "十七";
goto end;
eighteen:
$words .= "十八";
goto end;
nineteen:
$words .= "十九";
goto end;
twenty:
$words .= "二十";
goto end;
thirty:
$words .= "三十";
goto end;
forty:
$words .= "四十";
goto end;
fifty:
$words .= "五十";
goto end;
sixty:
$words .= "六十";
goto end;
seventy:
$words .= "七十";
goto end;
eighty:
$words .= "八十";
goto end;
ninety:
$words .= "九十";
goto end;
hundred:
$words .= "百";
goto end;
thousand:
$words .= "千";
goto end;
ten_thousand:
$words .= "万";
goto end;
hundred_million:
$words .= "亿";
goto end;
end:

start:
if ($num >= 100000000) {
    $temp = floor($num / 100000000);
    $num %= 100000000;
    goto hundred_million;
}
if ($num >= 10000) {
    $temp = floor($num / 10000);
    $num %= 10000;
    goto ten_thousand;
}
if ($num >= 1000) {
    $temp = floor($num / 1000);
    $num %= 1000;
    goto thousand;
}
if ($num >= 100) {
    $temp = floor($num / 100);
    $num %= 100;
    goto hundred;
}
if ($num >= 20) {
    $temp = floor($num / 10);
    $num %= 10;
    goto $temp . "0";
}
if ($num > 0) {
    goto $num;
}

echo $words;
?>