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<?php var_dump(unpack('C*', '9223372036854775807'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(19) { [1]=> int(57) [2]=> int(50) [3]=> int(50) [4]=> int(51) [5]=> int(51) [6]=> int(55) [7]=> int(50) [8]=> int(48) [9]=> int(51) [10]=> int(54) [11]=> int(56) [12]=> int(53) [13]=> int(52) [14]=> int(55) [15]=> int(55) [16]=> int(53) [17]=> int(56) [18]=> int(48) [19]=> int(55) }