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

Already a lot of possible solutions, I just want to add the one that I came up to solve my problem.

function truncate_decimals($number, $decimals=2)
{
  $factor = pow(10,$decimals); 
  $val = intval($number*$factor)/$factor;
  return $val;
}


truncate_decimals(199.9349,2);
// 199.93

Answer 2

number_format rounds the number

php > echo number_format(128.20512820513, 2)."\n";
128.21

I used preg_replace to really cut the string

php > echo preg_replace('/(\.\d\d).*/', '$1', 128.20512820513)."\n";
128.20

Answer 3

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