PHP show only significant (non-zero) decimals

Question

In PHP (using built-in functions) I\'d like to convert/format a number with decimal, so that only the non-zero decimals show. However, another requirement of mine is that if

Answer 1

If you want a built-in solution and you're using a PHP version later than 4.2 you could try floatval():

echo floatval(9.200);

prints

9.2

but

echo floatval(9.123);

prints

9.123

Hope this helps.

Answer 2

My solution is to let php handle it as a number (is *1) and then treat it as a string (my example I was using percentages stored as a decimal with 2 decimal places):

printf('%s%% off', $value*1);

This outputs:

0.00  => 0% off
0.01  => 0.01% off
20.00 => 20% off
20.50 => 20.5% off

Answer 3

I don't think theres a way to do that. A regex is probably your best solution:

$value = preg_replace('/(\.[0-9]+?)0*$/', '$1', $value);

Demo:

php> $a = array('0.000', '0.0001', '0.0101', '9.000', '9.100', '9.120', '9.123');
php> foreach($a as $b) { echo $b . ' => ' . preg_replace('/(\.[0-9]+?)0*$/', '$1', $b)."\n"; }
0.000 => 0.0
0.0001 => 0.0001
0.0101 => 0.0101
9.000 => 9.0
9.100 => 9.1
9.120 => 9.12
9.123 => 9.123

Answer 4

<?php
    $numbers = array(
        "9.000",
        "9.100",
        "9.120",
        "9.123"
    );
    foreach($numbers as $number) {
        echo sprintf(
            "%s -> %s\n",
            $number,
            (float) $number == (int) $number ? number_format($number, 1) : (float) $number
        );
    }
?>

Output:

9.000 -> 9.0
9.100 -> 9.1
9.120 -> 9.12
9.123 -> 9.123

Answer 5

A trailing zero is significant:

• A value of 9.0 implies, that the real value is more than 8.9 and less than 9.1
• A value of 9.00000 implies, that the real value is more than 8.99999 and less than 9.00001

Therefore, your requirement is quite unusual. That's the reason why no function exists to do what you want.