PHPで数字を中国語に変換する方法

function cny($money) {
    $cnums=array("零","壹","贰","叁","肆","伍","陆","柒","捌","玖");
    $cnyunits=array("圆","角","分");
    $grees=array("拾","佰","仟","万","拾","佰","仟","亿");
    if(strpos($money,'.') !== false){ //拆分整数小数 分别赋值给变量
         list($int,$dec)=explode(".",$money,2);
    }else{
        list($int,$dec)=[$money,0];
    }
    $dec=array_filter(array($dec[1],$dec[0])); //过滤分数
    $ret=array_merge($dec,array(implode("",cny_to_unit(str_split($int),$grees)),"")); //先处理单位
    $ret=implode("",array_reverse(cny_to_unit($ret,$cnyunits)));
    return str_replace(array_keys($cnums),$cnums,$ret);
}

function cny_to_unit($list,$units) {
    $ul=count($units);
    $xs=array();
    foreach (array_reverse($list) as $x) { /反转数组便于处理
        $l=count($xs);
        if ($x!="0" || !($l%4)) {
            if ($l != 0) {
                $n=($x=='0'?'':$x).($units[($l-1)%$ul]);
            }else{
                $n=($x=='0'?'':$x);
            }
        }
        else {
            $n=is_numeric($xs[0][0])?$x:'';
        }
        array_unshift($xs,$n);
    }
    return $xs;
}

echo cny('120');

echo cny('120.18');