轉換中文日期的PHP程式

本程式將中文日期輸出為2001-12-23，並很好解決了“十”的問題，如“十一”和“二十一”中“十”的處理！稍加修改可改為函數。
<?
$str="二零○一年十二月二十三日";
echo $str."<p>";
$flag=0;
$cn=array("一","二","三","四","五","六","七","八","九","十","零","○");
$num=array("1","2","3","4","5","6","7","8","9","","0","0");
$len=strlen($str);
for ($i=0;$i<$len;$i+=2)
{
$array_str[$i]=substr($str,$i,2);
$cout=0;
while($cout<count($cn))
{
if ($array_str[$i]==$cn[$cout])
{
if ($flag==1)
echo "-";
if (($array_str[$i]=="十") and ($flag==1))
{
$temp[$cout]="1";
echo $temp[$cout];
$flag=2;break;
}
$temp[$cout]=$num[$cout];
echo $temp[$cout];
$flag=2;
break;
}
else
{
if (count($cn)==$cout+1)
$flag=1;
}
$cout++;
}
}
?>