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<?php print_r(range(0, 9) + range('a', 'Z'));
Output for 4.3.0 - 7.1.0
Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 [6] => 6 [7] => 7 [8] => 8 [9] => 9 )