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<?php function acronym(string $text): array { preg_match_all('/\b\w/', $text, $matches); $letters = array_map('strtolower', $matches[0]); return $letters; } print_r(acronym('Ruby on Rails'));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => r [1] => o [2] => r )

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