W3cubDocs

/PHP

gmp_popcount

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

gmp_popcountPopulation count

Description

int gmp_popcount ( GMP $a )

Get the population count.

Parameters

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.

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

© 1997–2017 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.gmp-popcount.php