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<?php var_dump(unpack('C*', pack('L*', 9223372036854775807)));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [1]=> int(255) [2]=> int(255) [3]=> int(255) [4]=> int(255) }