gmp_popcount

(PHP 4 >= 4.0.4, PHP 5)

gmp_popcount -- Population count

Description

int gmp_popcount ( resource a )

Return the population count of a.

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 printout of the above program will be:

3
7