Php/docs/function.gmp-popcount
From Get docs
gmp_popcount
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_popcount — 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 int.
Examples
Example #1 gmp_popcount() example
<?php$pop1 = gmp_init("10000101", 2); // 3 1'secho gmp_popcount($pop1) . "\n";$pop2 = gmp_init("11111110", 2); // 7 1'secho gmp_popcount($pop2) . "\n";?>
The above example will output:
3 7
