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<?php var_dump(unpack('C*', pack('d*', 9223372036854775807)));
Output for 4.3.0 - 7.1.7
array(8) { [1]=> int(0) [2]=> int(0) [3]=> int(0) [4]=> int(0) [5]=> int(0) [6]=> int(0) [7]=> int(224) [8]=> int(67) }