(PHP 4 >= 4.0.4, PHP 5)
gmp_popcount — Population count
Get the population count.
It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.
The population count of a , as an integer.
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