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<?php function similarity($str1, $str2) { $len1 = strlen($str1); $len2 = strlen($str2); $max = max($len1, $len2); $similarity = $i = $j = 0; while (($i < $len1) && isset($str2[$j])) { if ($str1[$i] == $str2[$j]) { $similarity++; $i++; $j++; } elseif ($len1 < $len2) { $len1++; $j++; } elseif ($len1 > $len2) { $i++; $len1--; } else { $i++; $j++; } } return round($similarity / $max, 2); } $str1 = '12345678901234567890'; $str2 = '12345678991234567890'; echo 'Similarity: ' . (similarity($str1, $str2) * 100) . '%'; ?>
Output for git.master, git.master_jit, rfc.property-hooks
Similarity: 95%

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