用PHP计算小数位数的函数

function countDecimalPlaces($number) {
    $numAsString = (string) $number;
    $decimalIndex = strpos($numAsString, ".");
    if ($decimalIndex === false) {
        return 0;
    }
    return strlen(substr($numAsString, $decimalIndex + 1));
}

$number = 3.14159;
$decimalPlaces = countDecimalPlaces($number);
echo $decimalPlaces;