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<?php $input = ["a", "b"]; function search($input) { $result = $input; foreach($input as $a) { foreach($input as $b) { $result []= $a . $b; } } //return array_unique($result); return $result; } var_dump(search($input));
Output for git.master, git.master_jit, rfc.property-hooks
array(6) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(2) "aa" [3]=> string(2) "ab" [4]=> string(2) "ba" [5]=> string(2) "bb" }

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