Delete digits after two decimal points, without rounding the value

Question

i have value in php variable like that

$var=\'2.500000550\';
echo $var

what i want is to delete all decimal points after 2 digits.

Answer 1

floor - not quite! (floor rounds negative numbers)

A possible solution from cale_b answer.

static public function rateFloor($rate, $decimals)
{

    $div = "1" . str_repeat("0", $decimals);

    if ($rate > 0) {
        return floor($rate * $div) / $div;
    }

    $return = floor(abs($rate) * $div) / $div;

    return -($return);

}

---

static public function rateCeil($rate, $decimals)
{

    $div = "1" . str_repeat("0", $decimals);

    if ($rate > 0) {
        return ceil($rate * $div) / $div;
    }

    $return = ceil(abs($rate) * $div) / $div;

    return -($return);

}

Positive

Rate: 0.00302471

Floor: 0.00302400

Ceil: 0.00302500

Negative

Rate: -0.00302471

Floor: -0.00302400

Ceil: -0.00302500