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run code in 150+ php & hhvm versions
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<?php $al=range('a','z');$ah=range('A','Z');$n=range(0,9);$all=array_merge($al,$ah,$n); print_r($all);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => a [1] => b [2] => c [3] => d [4] => e [5] => f [6] => g [7] => h [8] => i [9] => j [10] => k [11] => l [12] => m [13] => n [14] => o [15] => p [16] => q [17] => r [18] => s [19] => t [20] => u [21] => v [22] => w [23] => x [24] => y [25] => z [26] => A [27] => B [28] => C [29] => D [30] => E [31] => F [32] => G [33] => H [34] => I [35] => J [36] => K [37] => L [38] => M [39] => N [40] => O [41] => P [42] => Q [43] => R [44] => S [45] => T [46] => U [47] => V [48] => W [49] => X [50] => Y [51] => Z [52] => 0 [53] => 1 [54] => 2 [55] => 3 [56] => 4 [57] => 5 [58] => 6 [59] => 7 [60] => 8 [61] => 9 )