is_finite

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

    is_finite — Checks whether a float is finite

    Description

    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()).

    Parameters

    num

    The float to check

    Return Values

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

    Examples

    Example #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));
    ?>

    The above example will output:

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

    See Also

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