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<?php print_r(array_merge(range(0, 9), range('a', 'Z')));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 [6] => 6 [7] => 7 [8] => 8 [9] => 9 [10] => a [11] => ` [12] => _ [13] => ^ [14] => ] [15] => \ [16] => [ [17] => Z )