Currency to word in php

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function CurrencyToWord($no)
{  

 $words = array('0'=> '' ,'1'=> 'One' ,'2'=> 'Two' ,'3' => 'Three','4' => 'Four','5' => 'Five','6' => 'Six','7' => 'Seven','8' => 'Eight','9' => 'Nine','10' => 'Ten','11' => 'Eleven','12' => 'Twelve','13' => 'Thirteen','14' => 'Fouteen','15' => 'Fifteen','16' => 'Sixteen','17' => 'Seventeen','18' => 'Eighteen','19' => 'Nineteen','20' => 'Twenty','30' => 'Thirty','40' => 'Fourty','50' => 'Fifty','60' => 'Sixty','70' => 'Seventy','80' => 'Eighty','90' => 'Ninty','100' => 'Hundred &','1000' => 'Thousand','100000' => 'Lakh','10000000' => 'Crore');
    if($no == 0)
        return ' ';
    else {
    $novalue='';
    $highno=$no;
    $remainno=0;
    $value=100;
    $value1=1000;      
            while($no>=100)    {
                if(($value <= $no) &&($no  < $value1))    {
                $novalue=$words["$value"];
                $highno = (int)($no/$value);
                $remainno = $no % $value;
                break;
                }
                $value= $value1;
                $value1 = $value * 100;
            }      
          if(array_key_exists("$highno",$words))
              return $words["$highno"]." ".$novalue." ".$this->CurrencyToWord($remainno);
          else {
             $unit=$highno%10;
             $ten =(int)($highno/10)*10;           
             return $words["$ten"]." ".$words["$unit"]." ".$novalue." ".$this->CurrencyToWord($remainno);
           }
    }
}