Remove useless 0 after 3 digits and round after 6 digit

Question

I use the floatval() function to remove useless 0s, but I want to keep at least 3 significant numbers. Like if I have 0.1800000 I want to show 0.180 and if I have 1.8454214 I want to show 1.845421. How can I do a round after 6 digits and remove useless 0s after 3 digits?

$value = 1.80000;
$value = floatval(round($value,6));
echo $value;   //I get 1.8

Or if I have

$value = 1.84542146543;
$value = floatval(round($value,6));
echo $value;   //I get 1.845421

And this works fine, but not if I've got a lot of 0s.

I always need minimum 3 decimal, but it can be more.

Per this answer (http://stackoverflow.com/questions/14531679/remove-useless-zero-digits-from-decimals-in-php) you can do `$value + 0` to remove any unnecessary trailing 0s. — WillardSolutions, May 16 '16 at 13:54

Arun · Answer 1 · 2016-05-17T07:21:27.120

1

Try with the below code

$value = 1.80000;
$value = floatval(round($value,6));
$valArr = explode('.', $value);
if(isset($valArr[1])){
    if(strlen($valArr[1]) < 3){
        $valArr[1] = str_pad($valArr[1], 3, "0", STR_PAD_RIGHT);
        $value = $valArr[0].'.'.$valArr[1];
    }
    else{
        $value = floatval(round($value,6));
    }
}

echo $value;

It will work if you want to print the 0s in your web page.

edited May 17 '16 at 07:21

answered May 16 '16 at 14:03

Arun

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It doesn't work when I have 12.1, it gives me 12.10 and I always need to put 3 decimals. It should be 12.100 – Samybel May 16 '16 at 16:43
@Samybel, Sorry for that. I have edited the answer. Please try now – Arun May 17 '16 at 06:35
you can use this echo round(1.80000,2); // 1.800 – Pardeep Pathania May 17 '16 at 07:17

Matt Raines · Accepted Answer · 2016-05-17T07:10:31.487

Use a combination of floor and sprintf to truncate the float to a string with 3 decimal places. Then use max to compare it with the rounded float. PHP will compare the values numerically, returning the first parameter (padded with zeros) if they are numerically the same, only returning the second value if it is numerically greater (ie there is a digit larger than 0 after the third decimal place).

$value = max(
    sprintf("%.3f", floor($value * pow(10, 3)) / pow(10, 3)),
    round($value, 6));

Remove useless 0 after 3 digits and round after 6 digit

2 Answers2