PHP function to convert RMB amount figures into Chinese capital letters

/**
 Convert the RMB amount to Chinese capital letters
 link: bbs.it-home.org
 date: 2013-2-28
*/
function cny($ns) {
static $cnums=array("zero","壹","谰","三","四","五","鲁","撒","八","九"),
$cnyunits=array("circle","angle","fen"),
$grees =array("十","百","千","万","十","百","千","万");
list($ns1,$ns2)=explode(". ",$ns,2);
$ns2=array_filter(array($ns2[1],$ns2[0]));
$ret=array_merge($ns2,array(implode("",_cny_map_unit(str_split( $ns1),$grees)),""));
$ret=implode("",array_reverse(_cny_map_unit($ret,$cnyunits))));
return str_replace(array_keys($cnums),$cnums,$ ret);
}
function _cny_map_unit($list,$units) {
$ul=count($units);
$xs=array();
foreach (array_reverse($list ) as $x) {
$l=count($xs);
if ($x!="0" || !($l%4)) $n=($x=='0'?'' :$x).($units[($l-1)%$ul]);
else $n=is_numeric($xs[0][0])?$x:'';
array_unshift($xs, $n);
}
return $xs;
}
?>

Usage: Pass numeric parameters directly The following example prints out uppercase numbers and outputs the result: one thousand two thousand one hundred twenty one yuan

echo cny('12121');
?>