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<?php $char1 = '!'; $char2 = '/'; $start = ord($char1); $stop = ord($char2); $set = array(); for($i=$start; $i < $stop; ($start < $stop? $i++: $i--)){ $set[] = chr($i); } print_r($set);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.6, 4.4.8 - 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, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 ( [0] => ! [1] => " [2] => # [3] => $ [4] => % [5] => & [6] => ' [7] => ( [8] => ) [9] => * [10] => + [11] => , [12] => - [13] => . )
Output for 4.4.7

Process exited with code 127.
preferences:
208.67 ms | 401 KiB | 327 Q