numberToChinese($key)

function numberToChinese($number) {
    $chineseNumbers = [
        0 => '零',
        1 => '一',
        2 => '二',
        3 => '三',
        4 => '四',
        5 => '五',
        6 => '六',
        7 => '七',
        8 => '八',
        9 => '九',
        10 => '十'
    ];
    
    $result = '';
    
    if ($number == 0) {
        return $chineseNumbers[0];
    }
    
    if ($number <= 10) {
        return $chineseNumbers[$number];
    } 
    elseif ($number < 20) {
        // 11-19 处理为 "十X"
        return $chineseNumbers[10] . $chineseNumbers[$number % 10];
    } 
    elseif ($number <= 99) {
        $tens = floor($number / 10);
        $units = $number % 10;
        
        $result = $chineseNumbers[$tens] . $chineseNumbers[10];
        if ($units > 0) {
            $result .= $chineseNumbers[$units];
        }
        return $result;
    }
    
    return "不支持的数字范围";}