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.
例子 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";
?>
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The printout of the above program will be:
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