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run code in 150+ php & hhvm versions
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<?php var_dump(unpack('d', pack('d', -100.876)));
Output for 4.3.5 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [1]=> float(-100.876) }
Output for 4.3.0 - 4.3.4
array(1) { [""]=> float(-100.876) }