Php/docs/function.gmp-hamdist
来自菜鸟教程
gmp_hamdist
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_hamdist — Hamming distance
说明
Returns the hamming distance between a
and
b
. Both operands should be non-negative.
参数
a
PHP 5.5 之前为 GMP 数值资源,PHP 5.6 之后为 GMP 对象或数字,或可以转为数字的字符串。
It should be positive.
b
PHP 5.5 之前为 GMP 数值资源,PHP 5.6 之后为 GMP 对象或数字,或可以转为数字的字符串。
It should be positive.
返回值
The hamming distance between a
and b
, as an int.
范例
Example #1 gmp_hamdist() example
<?php$ham1 = gmp_init("1001010011", 2);$ham2 = gmp_init("1011111100", 2);echo gmp_hamdist($ham1, $ham2) . "\n";/* hamdist is equivalent to: */echo gmp_popcount(gmp_xor($ham1, $ham2)) . "\n";?>
以上例程会输出:
6 6