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run code in 150+ php & hhvm versions
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<?php $data = '406429c28f5c28f6'; $num = unpack('d', strrev(($data))); var_dump($num);
Output for 4.3.5 - 7.1.0
array(1) { [1]=> float(5.221203805401E-37) }
Output for 4.3.0 - 4.3.4
array(1) { [""]=> float(5.221203805401E-37) }