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run code in 200+ php & hhvm versions
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<?php $a = serialize(array('TCUKA')); var_dump($a); $a = serialize(null); var_dump($a);
based on o8nY1
Output for 4.3.0 - 7.2.0
string(22) "a:1:{i:0;s:5:"TCUKA";}" string(2) "N;"