PHP: Calculate the number of digits after the decimal point

This article provides two ways to turn a decimal number into a string and then use the "." To intercept, to go. The length of the substring after. There is a decimal *10, such as the N-second side, such as 10 of 8 times to 8 times to the remainder, and then continue to 10 for the remainder, until the result of 10 remainder is not 0.

In contrast, the first method is much better, for example, 1.000004 at a very border time or 0.99999 such a child PHP processing will have problems, there will be errors, resulting in a different number of digits. And the precision is difficult to grasp, so dealing with this boundary-related problem can finally be done with strings or strings.

First Kind

Private Function _getfloatlength ($num) {
$count = 0;

$temp = Explode ('. ', $num);

if (sizeof ($temp) > 1) {
$decimal = end ($temp);
$count = strlen ($decimal);
}

return $count;
}

Second Kind

function Getfloatlength ($a) {
	if (($a-(int) $a) <1e-9) {
		$count =0;
	}
	$a =fmod (1e9* $a, 1E9);
	while ($a%10==0) {
		if ($a ==0) break;
		$a = $a/10;
		$count-;
	}
	return count;
}