For those without gmp support :
$hamming_distance = count(array_diff_assoc(str_split($string1), str_split($string2)));
And if you are not sure if your strings have equal length :
$hamming_distance = count(array_diff_assoc(str_split(str_pad($string1,strlen($string2)-strlen($string1),' ')), str_split(str_pad($string2,strlen($string1)-strlen($string2),' '))));
gmp_hamdist
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_hamdist — Hamming distance
설명
Returns the hamming distance between a and
b. Both operands should be non-negative.
인수
예제
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";
?>
위 예제의 출력:
6 6
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User Contributed Notes 2 notes
Bas Vijfwinkel ¶
6 years ago
grabzila at gmail dot com ¶
3 years ago
<?php
$hamdist = gmp_hamdist(-100, -10); // 4
$hamdist = gmp_hamdist(100, 10); // 5
?>
The function works great with negative numbers.
