gmp_hamdist

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

gmp_hamdistHamming distance

说明

gmp_hamdist(GMP|int|string $num1, GMP|int|string $num2): int

Returns the hamming distance between num1 and num2. Both operands should be non-negative.

参数

num1

GMP 对象、intstring,可以按照跟在 gmp_init() 中使用字符串并自动检测 base(即当 base 等于 0 时)相同的逻辑将其解释为数字。

It should be positive.

num2

GMP 对象、intstring,可以按照跟在 gmp_init() 中使用字符串并自动检测 base(即当 base 等于 0 时)相同的逻辑将其解释为数字。

It should be positive.

返回值

The hamming distance between num1 and num2, as an int.

示例

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";
?>

以上示例会输出:

6
6

参见