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run code in 150+ php & hhvm versions
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<?php $a = null; var_dump(md5($a));
Output for 4.3.0 - 5.6.23, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(32) "d41d8cd98f00b204e9800998ecf8427e"