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run code in 150+ php & hhvm versions
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<?php $sa=array(60 => array(1,5,6)); //print_r($sa); if($sa[60]!== "undefined"){echo implode(",",$sa);}
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Array to string conversion in /in/ifDfB on line 4 Array