decimalen -> breuk

<?php


  $decimal = -4.2;
  list ($whole, $numerator, $denominator, $top_heavy) = convert($decimal);
  print $whole;
  print "<BR>";
  print $numerator;
  print "<BR>";
  print $denominator;
  print "<BR>";
  print $top_heavy;


  function convert ($decimal) {
    if ($decimal == 0) {
      $whole = 0;
      $numerator = 0;
      $denominator = 1;
      $top_heavy = 0;
    }


    else {
      $sign = 1;
      if ($decimal < 0) {
        $sign = -1;
      }


      if (floor(abs($decimal)) == 0) {
        $whole = 0;
        $conversion = abs($decimal);
      }
      else {
        $whole = floor(abs($decimal));
        $conversion = abs($decimal);
      }


      $power = 1;
      $flag = 0;
      while ($flag == 0) {
        $argument = $conversion * $power;
        if ($argument == floor($argument)) {
          $flag = 1;
        }
        else {
          $power = $power * 10;
        }
      }


      $numerator = $conversion * $power;
      $denominator = $power;


      $hcf = euclid ($numerator, $denominator);


      $numerator = $numerator/$hcf;
      $denominator = $denominator/$hcf;
      $whole = $sign * $whole;
      $top_heavy = $sign * $numerator;


      $numerator = abs($top_heavy) - (abs($whole) * $denominator);


      if (($whole == 0) && ($sign == -1)) {
        $numerator = $numerator * $sign;
      }




    }
    return array($whole, $numerator, $denominator, $top_heavy);
  }






   function euclid ($number_one, $number_two) {


      if (($number_one == 0) or ($number_two == 0)) {
      $hcf = 1;
      return $hcf;
      }
      else {
         if ($number_one < $number_two) {
         $buffer = $number_one;
         $number_one = $number_two;
         $number_two = $buffer;
         }


         $dividend = $number_one;
         $divisor = $number_two;
         $remainder = $dividend;


         while ($remainder > 0) {
           if ((floor($dividend/$divisor)) == ($dividend/$divisor)) {
           $quotient = $dividend/$divisor;
           $remainder = 0;
           }
           else {
           $quotient = floor($dividend/$divisor);
           $remainder = $dividend - ($quotient * $divisor);
           }
           $hcf = $divisor;
           $dividend = $divisor;
           $divisor = $remainder;
         }




    }
   return $hcf;
   }


?>

$decimal = 2.5;
  
   //zet voor notatie helen + noemer op true
  $option = true;
  
  list ($whole, $numerator, $denominator, $top_heavy) = convert($decimal);
  if($option == true)
  	{
		$num = $numerator + ($whole*$denominator);
		print $num;
  		print "/";
  		print $denominator;
	}
  else
  	{
	  if($whole != 0)
  		{
  			print $whole;
  			print "  &  ";
			print $numerator;
  			print "/";
  			print $denominator;
		}
	}