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run code in 150+ php & hhvm versions
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<?php $arr = array(1,"","1"," ",NULL); for($i=0;$i<5;$i++) echo isset($arr[$i])." >> "; echo isset($adf);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
1 >> 1 >> 1 >> 1 >> >>