(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_hamdist — Hamming distance
Returns the hamming distance between a and
b. Both operands should be non-negative.
a可以是一个 GMP 数据 resouce，或一个可以转换为数值的字符串。
It should be positive.
b可以是一个 GMP 数据 resouce，或一个可以转换为数值的字符串。
It should be positive.
GMP 数值资源.
Example #1 gmp_hamdist() example
<?php
$ham1 = gmp_init("1001010011", 2);
$ham2 = gmp_init("1011111100", 2);
echo gmp_hamdist($ham1, $ham2) . "\n";
/* hamdist is equivalent to: */
echo gmp_popcount(gmp_xor($ham1, $ham2)) . "\n";
?>
以上例程会输出：
6 6