PHP5中文手册·Population count -- 追寻梦想＞编程乐园＞PHP 编程

说明

int gmp_popcount ( resource $a )

Get the population count.

参数

a: It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

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";
?>

上例将输出：

3
7


	PHP5中文手册 gmp_perfect_square gmp_pow GMP PHP Manual gmp_popcount (PHP 4 >= 4.0.4, PHP 5) gmp_popcount — Population count 说明 int gmp_popcount ( resource `$a` ) Get the population count. 参数 `a` It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number. 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"; ?>` 上例将输出： 3 7 gmp_perfect_square gmp_pow GMP PHP Manual