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<?php function countFoundSequences(string $needle, string $haystack): int { if (!$needle) { return 0; } $tally = 0; $need = substr($needle, 0, 1); foreach (str_split($haystack) as $i => $straw) { if ($need === $straw) { if ($need === $needle) { ++$tally; } else { $tally += countFoundSequences( substr($needle, 1), substr($haystack, $i + 1) ); } } } return $tally; } echo countFoundSequences('abc', 'abcababc');
Output for git.master, git.master_jit, rfc.property-hooks
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