删除字符串右侧的特定字符

Question

I need to remove zeros from the end of a string, but only up to 2 places from the right of a decimal point.

I'got a formatted price being handed over as a string, and that price is up to 5 decimal places. I need to strip unnecessary zeros from the price but leaving at least 2 to the right of a decimal place. For example:

£0.00230 -> £0.0023 and £1.50000 -> £1.50

Any help would be appreciated!

Answer 1

Final and last update hopefully... trim off all the zeros on the right then add 1 or 2 zeroes if needed.

function format_number($price) {
    if (preg_match('~^£\d+$~', $price)) {
        $price .= '.00';
    } else {
        $price = rtrim($price, '0');
        if (preg_match('~\.$~', $price)) {
            $price .= '00';
        } elseif (preg_match('~\.\d$~', $price)) {
            $price .= '0';
        }
    }
    return $price;
}
echo format_number('£230') . "
";
echo format_number('£230.12') . "
";
echo format_number('£23.024') . "
";
echo format_number('£230.00024') . "
";
echo format_number('£230.0240') . "
";
echo format_number('£230.2') . "
";

Output:

£230.00
£230.12
£23.024
£230.00024
£230.024
£230.20