<?php
class EnLetras
{
  var $Void = "";
  var $SP = " ";
  var $Dot = ".";
  var $Zero = "0";
  var $Neg = "Menos";
  
function ValorEnLetras($x, $Moneda ) 
{
    $s="";
    $Ent="";
    $Frc="";
    $Signo="";
        
    if(floatVal($x) < 0)
     $Signo = $this->Neg . " ";
    else
     $Signo = "";
    
    if(intval(number_format($x,2,'.','') )!=$x) //<- averiguar si tiene decimales
      $s = number_format($x,2,'.','');
    else
      $s = number_format($x,0,'.','');
       
    $Pto = strpos($s, $this->Dot);
        
    if ($Pto === false)
    {
      $Ent = $s;
      $Frc = $this->Void;
    }
    else
    {
      $Ent = substr($s, 0, $Pto );
      $Frc =  substr($s, $Pto+1);
    }

    if($Ent == $this->Zero || $Ent == $this->Void)
       $s = "Cero ";
    elseif( strlen($Ent) > 7)
    {
       $s = $this->SubValLetra(intval( substr($Ent, 0,  strlen($Ent) - 6))) . 
             "Millones " . $this->SubValLetra(intval(substr($Ent,-6, 6)));
    }
    else
    {
      $s = $this->SubValLetra(intval($Ent));
    }

    if (substr($s,-9, 9) == "Millones " || substr($s,-7, 7) == "Millón ")
       $s = $s . "de ";

    $s = $s . $Moneda;

    if($Frc != $this->Void)
    {
       $s = $s . " Con " . $this->SubValLetra(intval($Frc)) . "Centavos";
       //$s = $s . " " . $Frc . "/100";
    }
    return ($Signo . $s . " ");
   
}


function SubValLetra($numero) 
{
    $Ptr="";
    $n=0;
    $i=0;
    $x ="";
    $Rtn ="";
    $Tem ="";

    $x = trim("$numero");
    $n = strlen($x);

    $Tem = $this->Void;
    $i = $n;
    
    while( $i > 0)
    {
       $Tem = $this->Parte(intval(substr($x, $n - $i, 1). 
                           str_repeat($this->Zero, $i - 1 )));
       If( $Tem != "Cero" )
          $Rtn .= $Tem . $this->SP;
       $i = $i - 1;
    }

    
    //--------------------- GoSub FiltroMil ------------------------------
    $Rtn=str_replace(" Mil Mil", " Un Mil", $Rtn );
    while(1)
    {
       $Ptr = strpos($Rtn, "Mil ");       
       If(!($Ptr===false))
       {
          If(! (strpos($Rtn, "Mil ",$Ptr + 1) === false ))
            $this->ReplaceStringFrom($Rtn, "Mil ", "", $Ptr);
          Else
           break;
       }
       else break;
    }

    //--------------------- GoSub FiltroCiento ------------------------------
    $Ptr = -1;
    do{
       $Ptr = strpos($Rtn, "Cien ", $Ptr+1);
       if(!($Ptr===false))
       {
          $Tem = substr($Rtn, $Ptr + 5 ,1);
          if( $Tem == "M" || $Tem == $this->Void)
             ;
          else          
             $this->ReplaceStringFrom($Rtn, "Cien", "Ciento", $Ptr);
       }
    }while(!($Ptr === false));

    //--------------------- FiltroEspeciales ------------------------------
    $Rtn=str_replace("Diez Un", "Once", $Rtn );
    $Rtn=str_replace("Diez Dos", "Doce", $Rtn );
    $Rtn=str_replace("Diez Tres", "Trece", $Rtn );
    $Rtn=str_replace("Diez Cuatro", "Catorce", $Rtn );
    $Rtn=str_replace("Diez Cinco", "Quince", $Rtn );
    $Rtn=str_replace("Diez Seis", "Dieciseis", $Rtn );
    $Rtn=str_replace("Diez Siete", "Diecisiete", $Rtn );
    $Rtn=str_replace("Diez Ocho", "Dieciocho", $Rtn );
    $Rtn=str_replace("Diez Nueve", "Diecinueve", $Rtn );
    $Rtn=str_replace("Veinte Un", "Veintiun", $Rtn );
    $Rtn=str_replace("Veinte Dos", "Veintidos", $Rtn );
    $Rtn=str_replace("Veinte Tres", "Veintitres", $Rtn );
    $Rtn=str_replace("Veinte Cuatro", "Veinticuatro", $Rtn );
    $Rtn=str_replace("Veinte Cinco", "Veinticinco", $Rtn );
    $Rtn=str_replace("Veinte Seis", "Veintiseís", $Rtn );
    $Rtn=str_replace("Veinte Siete", "Veintisiete", $Rtn );
    $Rtn=str_replace("Veinte Ocho", "Veintiocho", $Rtn );
    $Rtn=str_replace("Veinte Nueve", "Veintinueve", $Rtn );

    //--------------------- FiltroUn ------------------------------
    If(substr($Rtn,0,1) == "M") $Rtn = "Un " . $Rtn;
    //--------------------- Adicionar Y ------------------------------
    for($i=65; $i<=88; $i++)
    {
      If($i != 77)
         $Rtn=str_replace("a " . Chr($i), "* y " . Chr($i), $Rtn);
    }
    $Rtn=str_replace("*", "a" , $Rtn);
    return($Rtn);
}


function ReplaceStringFrom(&$x, $OldWrd, $NewWrd, $Ptr)
{
  $x = substr($x, 0, $Ptr)  . $NewWrd . substr($x, strlen($OldWrd) + $Ptr);
}


function Parte($x)
{
    $Rtn='';
    $t='';
    $i='';
    Do
    {
      switch($x)
      {
         Case 0:  $t = "Cero";break;
         Case 1:  $t = "Un";break;
         Case 2:  $t = "Dos";break;
         Case 3:  $t = "Tres";break;
         Case 4:  $t = "Cuatro";break;
         Case 5:  $t = "Cinco";break;
         Case 6:  $t = "Seis";break;
         Case 7:  $t = "Siete";break;
         Case 8:  $t = "Ocho";break;
         Case 9:  $t = "Nueve";break;
         Case 10: $t = "Diez";break;
         Case 20: $t = "Veinte";break;
         Case 30: $t = "Treinta";break;
         Case 40: $t = "Cuarenta";break;
         Case 50: $t = "Cincuenta";break;
         Case 60: $t = "Sesenta";break;
         Case 70: $t = "Setenta";break;
         Case 80: $t = "Ochenta";break;
         Case 90: $t = "Noventa";break;
         Case 100: $t = "Cien";break;
         Case 200: $t = "Doscientos";break;
         Case 300: $t = "Trescientos";break;
         Case 400: $t = "Cuatrocientos";break;
         Case 500: $t = "Quinientos";break;
         Case 600: $t = "Seiscientos";break;
         Case 700: $t = "Setecientos";break;
         Case 800: $t = "Ochocientos";break;
         Case 900: $t = "Novecientos";break;
         Case 1000: $t = "Mil";break;
         Case 1000000: $t = "Millón";break;
      }

      If($t == $this->Void)
      {
        $i = $i + 1;
        $x = $x / 1000;
        If($x== 0) $i = 0;
      }
      else
         break;
           
    }while($i != 0);
   
    $Rtn = $t;
    Switch($i)
    {
       Case 0: $t = $this->Void;break;
       Case 1: $t = " Mil";break;
       Case 2: $t = " Millones";break;
       Case 3: $t = " Billones";break;
    }
    return($Rtn . $t);
}

}
//-------------- Programa principal ------------------------
?>