gmp_hamdist
(PHP 4 >= 4.0.4, PHP 5)
gmp_hamdist — Hamming distance
说明
int gmp_hamdist
( resource $a
, resource $b
)
Returns the hamming distance between a and b . Both operands should be non-negative.
参数
返回值
A GMP number resource.
范例
Example#1 gmp_hamdist() example
<?php
$ham1 = gmp_init("1001010011", 2);
$ham2 = gmp_init("1011111100", 2);
echo gmp_hamdist($ham1, $ham2) . "\n";
/* hamdist is equivilent to: */
echo gmp_popcount(gmp_xor($ham1, $ham2)) . "\n";
?>
上例将输出：
6 6
