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<?php $arr = [ "string text 123", "string text 100", "string text 555", ]; var_dump(array_reduce($arr, function(array $carry, string $value): array { $prefix = substr($value, 0, 12); $carry[$prefix][] = $value; return $carry; }, []));
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { ["string text "]=> array(3) { [0]=> string(15) "string text 123" [1]=> string(15) "string text 100" [2]=> string(15) "string text 555" } }

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