PHP - gmp_popcount() Function

---

---

Definition and Usage

The gmp_popcount() function calculates the population count.

Description

The gmp_popcount() counts the number of non-zero entries ('1' bits) in given byte, string etc.

Syntax

gmp_popcount ( GMP $a ) : int

Parameters

Return Values

PHP gmp_popcount() function returns population count as an integer.

PHP Version

This function will work from PHP Version greater than 5.0.0.

Example 1

Working of gmp_popcount −

<?php
   $pc = gmp_init("10000101", 2);
   $num = gmp_popcount($pc);
   echo "The result is : ".$num;
?>

This will produce following result −

The result is : 3

Example 2

Working of gmp_popcount() −

<?php
   $pc = gmp_init("1011111101", 2);
   $num = gmp_popcount($pc);
   echo "The result is : ".$num;
?>

This will produce following result −

The result is : 8