<?php
namespace Anzawi\FindDiff;
class Hamming
{
/**
* Calculate Hamming distance between two strings
* Note: In its simplest form the function will take only the two strings
* as parameter and will calculate just the number
* @param string $firstString One of the strings being evaluated for Hamming distance.
* @param string $secondString One of the strings being evaluated for Hamming distance.
* @return int
*/
public static function calculate(string $firstString, string $secondString): int
{
$i = 0;
$count = 0;
while (isset($firstString[$i]) != '') {
if (isset($firstString[$i]) && isset($secondString[$i])) {
if ($firstString[$i] != $secondString[$i]) {
$count++;
}
}
$i++;
}
return $count;
}
}
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