acos

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

    acos — Arc cosine

    Açıklama

    acos(float $num): float

    Returns the arc cosine of num in radians. acos() is the inverse function of cos(), which means that $num == cos(acos($num)) for every value of num that is in the domain of acos().

    Bağımsız Değişkenler

    num

    The argument to process

    Dönen Değerler

    The arc cosine of num in radians.

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    User Contributed Notes 1 note

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    isweet479338 at gmail dot com
    2 days ago
    Parameter:
    $num: A float value between -1 and 1. (Outside this range will return NAN)

    Returns:
    The arc cosine of the number in radians.

    NAN (Not A Number) if the input is outside [-1, 1].

    <?php
    $cosValue     = 0.5;
    $angle = acos($cosValue); // returns angle in radians
    echo $angle; // 1.0471975512 (which is ~60 degrees)

    echo rad2deg($angle); // Convert to degrees: ~60
    ?>
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