3v4l.org

run code in 300+ PHP versions simultaneously
<?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);

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50.19 ms | 402 KiB | 5 Q