php小写金额转大写

public static function num_case($num) {

$return = "";
$unit = array("分", "角", "元", "整");
$dw = array("", "拾", "佰", "仟", "", "万", "亿", "兆");
$char = array("零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖");
preg_match_all("/(\d*)\.?(\d*)/", $num, $ar);

if($ar[2][0] != ""){
$return .= $ar[2][0][0] == 0 ? "" : $char[$ar[2][0][0]] . $unit[1];
if(isset($ar[2][0][1])) $return .= $char[$ar[2][0][1]] . $unit[0];
}else{
$return .= $unit[3];
}


if ($ar[1][0] != "") {
$str = strrev($ar[1][0]);
$len = strlen($str);
$return = $unit[2] . $return;
for ($i = 0; $i $out[$i] = $char[$str[$i]];
$out[$i] .= $str[$i] != "0"? $dw[$i%4] : "";
if ($str[$i] + $str[$i-1] == 0)
$out[$i] = "";
if ($i%4 == 0)
$out[$i] .= $dw[4+floor($i/4)];
}
$return = join("",array_reverse($out)) . $return;
}
return $return;


}