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run code in 150+ php & hhvm versions
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<?php $arr = array(1=>1, 2=>2, 10=>10, 20=>20, 30 => 30 , 40=>40); var_dump(isset($arr[100]))); var_dump(in_array($arr[100]));
Output for 5.3.0 - 5.5.8
Parse error: syntax error, unexpected ')' in /in/PW5qW on line 3
Process exited with code 255.