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    gmp_testbit

    (PHP 5, PHP 7 >= 5.3.0)

    gmp_testbit — Tests if a bit is set

    Опис

    bool gmp_testbit ( GMP $a , int $index )

    Tests if the specified bit is set.

    Параметри

    a

    Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.

    index

    The bit to test

    Значення, що повертаються

    Returns TRUE if the bit is set in resource $a, otherwise FALSE.

    Помилки/Винятки

    An E_WARNING level error is issued when index is less than zero, and FALSE is returned.

    Приклади

    Приклад #1 gmp_testbit() example

    <?php
    $n     = gmp_init("1000000");
    var_dump(gmp_testbit($n, 1));
    gmp_setbit($n, 1);
    var_dump(gmp_testbit($n, 1));
    ?>

    Наведений вище приклад виведе:

    bool(false)
bool(true)

    Прогляньте Також

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    User Contributed Notes 1 note

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    bluej100@gmail
    16 years ago
    gmp_testbit will be very useful for my (over 64-bit) bitmask checking.

    In the meantime, I think these are the best replacements.

    Mostly full:

    <?php
    (gmp_scan1($a, $index) == $index)
    ?>

    Mostly empty:

    <?php
    (gmp_scan0($a, $index) != $index)
    ?>

    Still worst-case O(N), though.
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