PHP number: decimal point visible only if needed

问题:

I'd like to know if exists some function to automatically format a number by it's decimal, so if I have:

<?php
    // $sql_result["col_number"] == 1,455.75
    number_format ($sql_result["col_number"], 2, ".", "");
    // will return 1455.75

    // $sql_result["col_number"] == 1,455.00
    number_format ($sql_result["col_number"], 2, ".", "");
    // could I get 1455 instead of 1455.00?
?>

so my answer is if does exist some way to remove the decimals if I have DECIMAL data forma in my DB only when it's round?

Or shoud I do something like that?

<?php
    // $sql_result["col_number"] == 1,455.00
    str_replace(".00", "", (string)number_format ($sql_result["col_number"], 2, ".", ""));
    // will return 1455
?>

回答1:

I actually think that your workaround is as good as any. It's simple and clear, and there's really no point talking about performance here, so just go for it.

回答2:

floatval or simply casting to float

php > echo floatval(7.00);
7
php > echo floatval(2.30);
2.3
php > echo floatval(1.25);
1.25
php > echo floatval(1.125);
1.125

php > echo (float) 7.00;
7
php > echo (float) 2.30;
2.3
php > echo (float) 1.25;
1.25
php > echo (float) 1.125;
1.125

回答3:

As Emil says yours are good. But if you want to remove 0 from e.g. 7.50 too, I've got a suggestion, rtrim():

<?php
    // if $sql_result["col_number"] == 1,455.50
    rtrim(rtrim(number_format($sql_result["col_number"], 2, ".", ""), '0'), '.');
    // will return 1455.5
?>

回答4:

I add the article Remove useless zero digits from decimals in PHP as a nicer way to clean the value without loose decimal if needed.

回答5:

You could also use rtrim(), which would remove excess 0s, in the case where you might want to keep one decimal place but not the excess zeros. (For example, 4.50 becomes 4.5.) Also allows you to change the number of decimal places from 2 to any other number.

rtrim(rtrim((string)number_format($value, 2, ".", ""),"0"),".");

// 4.00 -> 4
// 4.50 -> 4.5
// 4.54000000 -> 4.54 (if you're doing more decimal places)

回答6:

Actually I think the cleanest way I can think of to do this for someone that just did a search looking for this sort of thing is to do this:

( number_format ($sql_result["col_number"], 2) * 100 ) / 100;

回答7:

If you are targeting US currency I like to use this method:

function moneyform($number, $symbol = true) {
    return str_replace(".00", "", money_format(($symbol? '%.2n' : "%!n"), $number));
}

moneyform(1300999);
-->$1,300,999

moneyform(2500.99);
-->$2,500.99

moneyform(2500.99, false);
-->2,500.99

回答8:

Warren.S answer helped me out. I didn't need the number_format function, so I just did this

$value=$value-0;

But in the OP's case, he needs number_format to remove the commas. So this would work for him

$value=number_format ($sql_result["col_number"], 2, ".", "")-0;

回答9:

Since I could not find a flexible solution I wrote a simple function to get the best result:

function getValueFormattedWithMinimalDecimals($value, $max_decimals = 2, $dec_point = ',', $thousands_sep = '') {
    $bestNumberOfDecimals = -1;
    $decimal = 0;
    while ($decimal <= $max_decimals) {
        $bestNumberOfDecimals = $decimal;
        $valueDecimals = number_format($value, $decimal);
        if (floatval($value) == $valueDecimals) {
            break;
        }
        $decimal++;
    }
    if($bestNumberOfDecimals > 0 && number_format($value, $bestNumberOfDecimals) == number_format($value, 0)) {
        $bestNumberOfDecimals = 0;
    }

    return number_format($value, $bestNumberOfDecimals, $dec_point, $thousands_sep);
}

回答10:

I've been accused of doing something like this:

 floatval($foo) == intval($foo) ? number_format($foo) : number_format($foo,2);

回答11:

What about

number_format($value,2) - 0;