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This document uses PHP Chinese website manual Release
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_popcount — Population count
$a
)Get the population count.
a
可以是一个 GMP 数据 resouce ,或一个可以转换为数值的字符串。
The population count of a
, as an integer .
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" ;
?>
以上例程会输出:
3 7