Trouble with number_format

[jakebur01]

I'm attempting to multiply a number.  It does fine unformatted, but when I add number_format and the number is above 1,000 with a comma separator, it has problems.  I tried formatting with out the comma, then adding back in after the calculation, but that did not work.

$value = 1000;
$multiplier = 1.02;

for ($i = 1; $i <= 10; $i++) {
      $value = number_format($value, 2, '.', '');
      $value = $value * $multiplier;
      $value = number_format($value, 2);
      echo "$$value<br />";
}

 

[jakebur01]

Man, 10 years ago this used to be a hot site!  Where did everybody go?

[Barand]

The number value of the string "1,000" is 1. (ie anything befor the first non-numeric character.)

Do all your maths on unformatted numbers and only format imediately prior to output.

$value = 1000;
$multiplier = 1.02;

for ($i = 1; $i <= 10; $i++) {
      $value *= $multiplier;
      echo  number_format($value, 2) . '<br>';
}

 

[ginerjm]

When you 'format' a numeric value it no longer is a number - it's a STRING!