数字转汉字

function numToWord($num)
{
    $chiNum = array('零', '一', '二', '三', '四', '五', '六', '七', '八', '九');
    $chiNum['-'] = '负';
    $chiNum['+'] = '正';
    $chiUni = array('', '十', '百', '千', '万', '亿', '十', '百', '千');
    $num_str = (string)$num;
    $count = strlen($num_str);
    $last_flag = true; //上一个 是否为0
    $zero_flag = true; //是否第一个
    $temp_num = null; //临时数字
    $chiStr = '';//拼接结果
    if ($count == 2) {//两位数
        $temp_num = $num_str[0];
        $chiStr = $temp_num == 1 ? $chiUni[1] : $chiNum[$temp_num] . $chiUni[1];
        $temp_num = $num_str[1];
        $chiStr .= $temp_num == 0 ? '' : $chiNum[$temp_num];
    } else if ($count > 2) {
        $index = 0;
        for ($i = $count - 1; $i >= 0; $i--) {
            $temp_num = $num_str[$i];
            if ($temp_num == 0) {
                if (!$zero_flag && !$last_flag) {
                    $chiStr = $chiNum[$temp_num] . $chiStr;
                    $last_flag = true;
                }
            } else {
                $chiStr = $chiNum[$temp_num] . $chiUni[$index % 9] . $chiStr;
                $zero_flag = false;
                $last_flag = false;
            }
            $index++;
        }
    } else {
        $chiStr = $chiNum[$num_str[0]];
    }
    return $chiStr;
}
$num = -44;
echo numToWord($num);

输出

负四十四