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<?php var_dump(array_keys(array_fill(0, 24, 0)));
based on qG6nT
Output for 4.3.0 - 7.2.0
array(24) { [0]=> int(0) [1]=> int(1) [2]=> int(2) [3]=> int(3) [4]=> int(4) [5]=> int(5) [6]=> int(6) [7]=> int(7) [8]=> int(8) [9]=> int(9) [10]=> int(10) [11]=> int(11) [12]=> int(12) [13]=> int(13) [14]=> int(14) [15]=> int(15) [16]=> int(16) [17]=> int(17) [18]=> int(18) [19]=> int(19) [20]=> int(20) [21]=> int(21) [22]=> int(22) [23]=> int(23) }