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My attempts at exercism.org
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123456789101112131415161718192021<?php
declare(strict_types=1);
function distance(string $strandA, string $strandB): int{ if (strlen($strandA) != strlen($strandB)) { throw new InvalidArgumentException("strands must be of equal length"); }
$distance = 0;
for ($i = 0; $i < strlen($strandA); $i++) { if ($strandA[$i] != $strandB[$i]) { $distance++; } }
return $distance;}