Convert numbers to English_PHP tutorial

//*** Description: Convert numerical value to English representation
//=== Return:
//--- NN )Value FF) Decimal places
//========================================== =====================
function xf_num2en($NN, $FF=0) {
//===[prefix]== ======================================
if (!is_numeric($NN)) return '';
($FF>2) and $FF=2;
$xn=''; $enws= array( 
     0=>"zero",1=>"one",2=>"two",3=>"three",4=>"four", 
    5= >"five",6=>"six",7=>"seven",8=>"eight",9=>"nine",      " sixteen",17=>"seventeen",18=>"eighteen",19=>"nineteen",                                              "forty",50=>"fifty", 
     60=>"sixty",70=>"seventy",80=>"eighty",90=>"ninety");  
          //===[integer]==========================================  $ Nk = Floor ($ nn);
$ cNT = 0;
While ($ nk) {
$ n = $ nk%1000;
if ($ n) {                $x=xf_enNum4($n);                                     elseif ($cnt==2)                                                              . 'million '. $xn;
elseif ($cnt==3) $xn=$x. 'billion '. $xn;
elseif ($cnt==4) $xn= $x. ' trillion '. $xn;
else $xn=$x;
}
$cnt+=1;
               $nk=floor($nk/1000);                                                       //--while  
        //===[小數]========================================  
          if ($FF>0) {  
              $n=floor($NN*100) % 100;  
              ($n) and $xf=xf_enNum4($n). 'cent';  
          }  

          return $xn.$xf;  
    }   //--xf_num2en  

    function xf_enNum4($NN) {  
        global $enws;  
        $ans='';  
        $n=floor($NN/100);  
        ($n) and $ans=$enws[$n]. ' hundred ';  
        $n=$NN % 100;  
        if ($n) {  
            if ($n<20)  $ans.=$enws[$n]. ' ';  
            else {  
                $m=floor($n/10) * 10;  
                $ans.=$enws[$m]. ' ';  
                $n=$n % 10;  
                ($n) and $ans.=$enws[$n]. ' ';  
            }  
        }  
        return $ans;  
    }   //--xf_enNum4 ?>

http://www.bkjia.com/PHPjc/317486.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/317486.htmlTechArticle?php//___{xf_num2en}________________________________________ //***說明:數值轉英文表示法 //===回傳:string //---NN)數值FF)小數位 //===================================...