gmp_popcount

    (PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

    gmp_popcount — Population count

    说明

    gmp_popcount(GMP|int|string$num): int

    Get the population count.

    参数

    num

    GMP 对象或 int ，或数字string。

    返回值

    The population count of num, as an int.

    示例

    示例 #1 gmp_popcount() example

    <?php
    $pop1     = gmp_init("10000101", 2); // 3 1's
    echo gmp_popcount($pop1) . "\n";
    $pop2 = gmp_init("11111110", 2); // 7 1's
    echo gmp_popcount($pop2) . "\n";
    ?>

    以上示例会输出：

    3 7
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