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<?php print_r(array_merge(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 [10] => a [11] => b [12] => c [13] => d [14] => e [15] => f [16] => g [17] => h [18] => i [19] => j [20] => k [21] => l [22] => m [23] => n [24] => o [25] => p [26] => q [27] => r [28] => s [29] => t [30] => u [31] => v [32] => w [33] => x [34] => y [35] => z )