(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_hamdist — Hamming distance
Returns the hamming distance between num1 and
num2. Both operands should be non-negative.
The hamming distance between num1 and num2, as an int.
示例 #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