PHP 5.4.31 Released

gmp_popcount

(PHP 4 >= 4.0.4, PHP 5)

gmp_popcountPopulation count

说明

int gmp_popcount ( GMP $a )

Get the population count.

参数

a

可以是一个 GMP 数据 resouce,或一个可以转换为数值的字符串。

返回值

The population count of a, as an integer.

范例

Example #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";
?>

以上例程会输出:

3
7

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