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run code in 200+ php & hhvm versions
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<?php var_dump(unpack("f", "\x3c\x6b\x2c\x45"));
Output for 4.3.5 - 7.2.0
array(1) { [1]=> float(2758.7021484375) }
Output for 4.3.0 - 4.3.4
array(1) { [""]=> float(2758.7021484375) }