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run code in 150+ php & hhvm versions
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(<?php function hu ($a, $b=null) { if(!isset($b)) echo "$b is NULL"; } hu ( 1 );
based on jJIfE
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
( is NULL