PHP: get number of decimal digits

Question

Is there a straightforward way of determining the number of decimal places in a(n) integer/double value in PHP? (that is, without using explode)

Answer 1

You should always be careful about different locales. European locales use a comma for the thousands separator, so the accepted answer would not work. See below for a revised solution:

 function countDecimalsUsingStrchr($stringValue){
        $locale_info = localeconv();
        return strlen(substr(strrchr($stringValue, $locale_info['decimal_point']), 1));
    }

see localeconv

Answer 2

If you want readability for the benefit of other devs, locale safe, use:

function countDecimalPlacesUsingStrrpos($stringValue){
    $locale_info = localeconv();
    $pos = strrpos($stringValue, $locale_info['decimal_point']);
    if ($pos !== false) {
        return strlen($stringValue) - ($pos + 1);
    }
    return 0;
}

see localeconv

Answer 3

Less code:

$str = "1.1234567";
echo strpos(strrev($str), ".");

Answer 4

$value = 182.949;

$count = strlen(abs($value - floor($value))) -2; //0.949 minus 2 places (0.)

Answer 5

First I have found the location of the decimal using strpos function and increment the strpos postion value by 1 to skip the decimal place.

Second I have subtracted the whole string length from the value I have got from the point1.

Third I have used substr function to get all digits after the decimal.

Fourth I have used the strlen function to get length of the string after the decimal place.

This is the code that performs the steps described above:

     <?php
        $str="98.6754332";
        echo $str;
        echo "<br/>";
        echo substr( $str, -(strlen($str)-(strpos($str, '.')+1)) );
        echo "<br/>";
        echo strlen( substr( $str, -(strlen($str)-(strpos($str, '.')+1))) );
    ?>

Answer 6

This will work for any numbers, even in scientific notation, with precision up to 100 decimal places.

$float = 0.0000005;

$working = number_format($float,100);
$working = rtrim($working,"0");
$working = explode(".",$working);
$working = $working[1];

$decmial_places = strlen($working);

Result:

7

Lengthy but works without complex conditionals.