<?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);
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