round

    (PHP 4, PHP 5, PHP 7, PHP 8)

    round — Rounds a float

    Açıklama

    round(int|float$num, int$precision = 0, int$mode = PHP_ROUND_HALF_UP): float

    Returns the rounded value of num to specified precision (number of digits after the decimal point). precision can also be negative or zero (default).

    Bağımsız Değişkenler

    num

    The value to round.

    precision

    The optional number of decimal digits to round to.

    If the precision is positive, num is rounded to precision significant digits after the decimal point.

    If the precision is negative, num is rounded to precision significant digits before the decimal point, i.e. to the nearest multiple of pow(10, -$precision), e.g. for a precision of -1 num is rounded to tens, for a precision of -2 to hundreds, etc.

    mode

    Use one of the following constants to specify the mode in which rounding occurs.

    SabitlerAçıklama
    PHP_ROUND_HALF_UP Rounds num away from zero when it is half way there, making 1.5 into 2 and -1.5 into -2.
    PHP_ROUND_HALF_DOWN Rounds num towards zero when it is half way there, making 1.5 into 1 and -1.5 into -1.
    PHP_ROUND_HALF_EVEN Rounds num towards the nearest even value when it is half way there, making both 1.5 and 2.5 into 2.
    PHP_ROUND_HALF_ODD Rounds num towards the nearest odd value when it is half way there, making 1.5 into 1 and 2.5 into 3.

    Dönen Değerler

    The value rounded to the given precision as a float.

    Sürüm Bilgisi

    Sürüm: Açıklama
    8.0.0num no longer accepts internal objects which support numeric conversion.

    Örnekler

    Örnek 1 round() examples

    <?php
    var_dump    (round(3.4));
    var_dump(round(3.5));
    var_dump(round(3.6));
    var_dump(round(3.6, 0));
    var_dump(round(5.045, 2));
    var_dump(round(5.055, 2));
    var_dump(round(345, -2));
    var_dump(round(345, -3));
    var_dump(round(678, -2));
    var_dump(round(678, -3));
    ?>

    Yukarıdaki örneğin çıktısı:

    float(3) float(4) float(4) float(4) float(5.05) float(5.06) float(300) float(0) float(700) float(1000)

    Örnek 2 How precision affects a float

    <?php
    $number     = 135.79;

    var_dump(round($number, 3));
    var_dump(round($number, 2));
    var_dump(round($number, 1));
    var_dump(round($number, 0));
    var_dump(round($number, -1));
    var_dump(round($number, -2));
    var_dump(round($number, -3));
    ?>

    Yukarıdaki örneğin çıktısı:

    float(135.79) float(135.79) float(135.8) float(136) float(140) float(100) float(0)

    Örnek 3 mode examples

    <?php
    echo 'Rounding modes with 9.5' . PHP_EOL;
    var_dump(round(9.5, 0, PHP_ROUND_HALF_UP));
    var_dump(round(9.5, 0, PHP_ROUND_HALF_DOWN));
    var_dump(round(9.5, 0, PHP_ROUND_HALF_EVEN));
    var_dump(round(9.5, 0, PHP_ROUND_HALF_ODD));

    echo     PHP_EOL;
    echo     'Rounding modes with 8.5' . PHP_EOL;
    var_dump(round(8.5, 0, PHP_ROUND_HALF_UP));
    var_dump(round(8.5, 0, PHP_ROUND_HALF_DOWN));
    var_dump(round(8.5, 0, PHP_ROUND_HALF_EVEN));
    var_dump(round(8.5, 0, PHP_ROUND_HALF_ODD));
    ?>

    Yukarıdaki örneğin çıktısı:

    Rounding modes with 9.5 float(10) float(9) float(10) float(9) Rounding modes with 8.5 float(9) float(8) float(8) float(9)

    Örnek 4 mode with precision examples

    <?php
    echo 'Using PHP_ROUND_HALF_UP with 1 decimal digit precision' . PHP_EOL;
    var_dump(round( 1.55, 1, PHP_ROUND_HALF_UP));
    var_dump(round(-1.55, 1, PHP_ROUND_HALF_UP));

    echo     PHP_EOL;
    echo     'Using PHP_ROUND_HALF_DOWN with 1 decimal digit precision' . PHP_EOL;
    var_dump(round( 1.55, 1, PHP_ROUND_HALF_DOWN));
    var_dump(round(-1.55, 1, PHP_ROUND_HALF_DOWN));

    echo     PHP_EOL;
    echo     'Using PHP_ROUND_HALF_EVEN with 1 decimal digit precision' . PHP_EOL;
    var_dump(round( 1.55, 1, PHP_ROUND_HALF_EVEN));
    var_dump(round(-1.55, 1, PHP_ROUND_HALF_EVEN));

    echo     PHP_EOL;
    echo     'Using PHP_ROUND_HALF_ODD with 1 decimal digit precision' . PHP_EOL;
    var_dump(round( 1.55, 1, PHP_ROUND_HALF_ODD));
    var_dump(round(-1.55, 1, PHP_ROUND_HALF_ODD));
    ?>

    Yukarıdaki örneğin çıktısı:

    Using PHP_ROUND_HALF_UP with 1 decimal digit precision float(1.6) float(-1.6) Using PHP_ROUND_HALF_DOWN with 1 decimal digit precision float(1.5) float(-1.5) Using PHP_ROUND_HALF_EVEN with 1 decimal digit precision float(1.6) float(-1.6) Using PHP_ROUND_HALF_ODD with 1 decimal digit precision float(1.5) float(-1.5)

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