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PHP

Population count


gmp_popcount

(PHP 4 >= 4.0.4, PHP 5)

gmp_popcountPopulation count

Description

int gmp_popcount ( resource $a )

Get the population count.

Parameters

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.

Return Values

The population count of a, as an integer.

Examples

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";
?>

The above example will output:

 3 7 



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