(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_hamdist — Distância de Hamming
Retorna a distância de Hamming entre num1 e
num2. Ambos argumentos devem ser positivos.
A distância de Hamming entre num1 e num2, do tipo int.
Exemplo #1 Exemplo de gmp_hamdist()
<?php
$ham1 = gmp_init("1001010011", 2);
$ham2 = gmp_init("1011111100", 2);
echo gmp_hamdist($ham1, $ham2) . "\n";
/* a distância de Hamming é equivalente a : */
echo gmp_popcount(gmp_xor($ham1, $ham2)) . "\n";
?>O exemplo acima produzirá:
6 6
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),' '))));<?php
$hamdist = gmp_hamdist(-100, -10); // 4
$hamdist = gmp_hamdist(100, 10); // 5
?>
The function works great with negative numbers.