价格格式化有关问题

header("Content-type: text/html; charset=utf-8");
function removeAfterZero($str) {
    $s = $str;
    $r = '';
    for ($i = strlen($s)-1; $i > 0; $i--) {
        if ($s[$i] == 0)  {
            $s = substr($s, 0, $i);
            $r = $s;
        } else {
            break;
        }
    }
    return $r;
}

$num = 1000100;
if (strlen(strlen($num) < 5))
    echo $num;
else if (strlen($num) >= 5 && strlen($num) < 6) {    
    if (removeAfterZero(substr($num, 1, strlen($num)-1)) == 0)
        echo  substr($num, 0, 1) . "万";
    else     
        echo  substr($num, 0, 1) . '.' .  removeAfterZero(substr($num, 1, strlen($num)-1)) . "万";
}else if (strlen($num) >= 6 && strlen($num) < 7) {
     if (removeAfterZero(substr($num, 2, strlen($num)-2)) == 0)
        echo  substr($num, 0, 2) . "万";
    else     
        echo  substr($num, 0, 2) . '.' .  removeAfterZero(substr($num, 2, strlen($num)-2)) . "万";
}else if (strlen($num) >= 7 && strlen($num) < 8) {
    if (removeAfterZero(substr($num, 3, strlen($num)-3)) == 0)
        echo  substr($num, 0, 3) . "万";
    else     
        echo  substr($num, 0, 3) . '.' .  removeAfterZero(substr($num, 3, strlen($num)-3)) . "万";
}

$num = 100000;
echo $num < 10000 ? $num : $num/10000 . '万';