is_finite

    (PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

    is_finite — Checks whether a float is finite

    Açıklama

    is_finite(float $num): bool

    Returns whether the given num is a finite float.

    A finite float is neither NAN (is_nan()), nor infinite (is_infinite()).

    Bağımsız Değişkenler

    num

    The float to check

    Dönen Değerler

    true if num is none of NAN, INF, -INF, else false.

    Örnekler

    Örnek 1 is_finite() example

    <?php
    $float     = 1.2345;
    var_dump($float, is_finite($float));

    $nan = sqrt(-1);
    var_dump($nan, is_finite($nan));

    $inf = 1e308 * 2;
    var_dump($inf, is_finite($inf));
    ?>

    Yukarıdaki örneğin çıktısı:

    float(1.2345)
bool(true)
float(NAN)
bool(false)
float(INF)
bool(false)

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    User Contributed Notes 1 note

    up
    9
    Daniel Klein
    7 years ago
    (is_finite($float)) is equivalent to (!is_infinite($float) && !is_nan($float)), i.e. a number can only be one of finite, infinite and NaN. You don't need to check both is_infinite() and is_nan() to see if a number is invalid or out of range.

    <?php
    $finite     = 42;
    $infinite = log(0);
    $nan = acos(2);

    var_dump(is_finite($finite), is_infinite($finite), is_nan($finite)); // true, false, false
    var_dump(is_finite($infinite), is_infinite($infinite), is_nan($infinite)); // false, true, false
    var_dump(is_finite($nan), is_infinite($nan), is_nan($nan)); // false, false, true
    ?>
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