[SOLVED] Floating Point Comparison

[ainoy31]

Hello-

 

I am having an issue with comparing floating point values.  I did a var_dump() on both of my variables and one of them is a string and the other is a float.  So, I did a type cast of the string variable to a float.  Here is my code:

 

$balance = (float)$data->balance;

$foundMoney = 0;
$current = 0;
while(($row = fncDBMoveNext($result)) != NULL)
{
     if($balance > $foundMoney)
     {
          if($row->amount > ($balance - $foundMoney) ) 
          {
               $agingAmount = $balance - $foundMoney;
  $foundMoney += ($balance - $foundMoney);
          } 
          else 
          {
               $foundMoney += $row->amount;
  $agingAmount = $row->amount;
          }
          if ($row->age > $age) 
          {
               $age = $row->age;
          }
     }
     else
     {
           break;
     }
}

If I var_dump the $balance and $foundMoney variables, it returns a float(xxx.xx).  Here is the issue.  During the loop, the $foundMoney value will become equal to or greater than the value of the $balance, thus cause it to break out of the if($balance > $foundMoney) comparison.  However, when $foundMoney is float(250.35) and $balance is float(250.35) it does not cause it to break out but rather continue the unwanted calculation.  

 

Hope this is easy to read and understand.  Much appreciation.

[PFMaBiSmAd]

Read the warning at this link - http://us.php.net/float

[ainoy31]

Thanks man.  I saw this page and overlooked the warning section.  I used the bccomp() function and it helped me out.

 

Here is what I used:

 

$value = bccomp($balance, $foundMoney, 2);

 

Instead of using if($balance > $foundMoney), I plugged in this:

if($value == 1)

{

      .....etc

}