Question 186832 in PHP Question posted in
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Php – How to round off based on decimal number?

I need to round the numbers.

46.38 >>> 46.40
46.40 >>> 46.40
46.41 >>> 46.50

I am using round($price, 1) but this converts 46.41 to 46.40. But i need 46.50

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2

Answers


  1. 0

    You need ceil instead of round, but it does not come with precision out of the box. You need to add this functionality yourself like e.g.

    function myceil(int|float $number, int $precision, int $decimals) {
    return number_format(ceil($number*(10**$precision))/(10**$precision), 2);
}

    You can then use it as:

    echo myceil(46.38,1, 2).PHP_EOL;
echo myceil(46.40,1, 2).PHP_EOL;
echo myceil(46.41,1, 2).PHP_EOL;

    This will output:

    46.40
    46.40
    46.50

    3v4l code

    Note: The number_format is added to additionally control the decimals that will be shown in the end. It is not (strictly speaking) necessary and also causes the function output to be a string rather than a float.

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  2. 0

    I recommend this approach:

    $roundedPrice = round($price + 0.05, 1, PHP_ROUND_HALF_DOWN);

    This produces the outputs required from the inputs given.

    … or more generally, if $precision is the number of digits to the right of the decimal point,

    $roundedPrice = round($price + (1/10**$precision)/2, $precision, PHP_ROUND_HALF_DOWN);
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