Here I get two decimals after the `.`

(dot) using a function...

```
function truncate_number($number, $precision = 2) {
// Zero causes issues, and no need to truncate
if (0 == (int)$number) {
return $number;
}
// Are we negative?
$negative = $number / abs($number);
// Cast the number to a positive to solve rounding
$number = abs($number);
// Calculate precision number for dividing / multiplying
$precision = pow(10, $precision);
// Run the math, re-applying the negative value to ensure
// returns correctly negative / positive
return floor( $number * $precision ) / $precision * $negative;
}
```

Results from the above function:

```
echo truncate_number(2.56789, 1); // 2.5
echo truncate_number(2.56789); // 2.56
echo truncate_number(2.56789, 3); // 2.567
echo truncate_number(-2.56789, 1); // -2.5
echo truncate_number(-2.56789); // -2.56
echo truncate_number(-2.56789, 3); // -2.567
```

**New Correct Answer**

Use the PHP native function bcdiv

```
echo bcdiv(2.56789, 1, 1); // 2.5
echo bcdiv(2.56789, 1, 2); // 2.56
echo bcdiv(2.56789, 1, 3); // 2.567
echo bcdiv(-2.56789, 1, 1); // -2.5
echo bcdiv(-2.56789, 1, 2); // -2.56
echo bcdiv(-2.56789, 1, 3); // -2.567
```

reducesprecision. It will not add decimal places to a number that doesn't have them. Based on many of the answers and comments, it seems like people are thinking that rounding is something it isn't.`round`

is a math function, and this is just a formatting problem.