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<?php $array = array("bla","ble","blu","ab","bc","asdda","fju","ha","y","yi","yid"); $sorted_array = $array; natsort($sorted_array); $grouped_array = array(); foreach ($sorted_array as $item) { $letter = substr($item, 0, 1); $grouped_array[$letter][] = $item; } var_dump($grouped_array);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(5) { ["a"]=> array(2) { [0]=> string(2) "ab" [1]=> string(5) "asdda" } ["b"]=> array(4) { [0]=> string(2) "bc" [1]=> string(3) "bla" [2]=> string(3) "ble" [3]=> string(3) "blu" } ["f"]=> array(1) { [0]=> string(3) "fju" } ["h"]=> array(1) { [0]=> string(2) "ha" } ["y"]=> array(3) { [0]=> string(1) "y" [1]=> string(2) "yi" [2]=> string(3) "yid" } }

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240.69 ms | 406 KiB | 342 Q