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run code in 150+ php & hhvm versions
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<?php $stuff = [ 'foo' => 'zoo', 'bar' => 'blue', 'baz' => 'kapow' ]; $incomming = 'banana'; var_dump($stuff[$incomming]); if (!empty($stuff[$incomming])){ var_dump($stuff[$incomming]); }
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined index: banana in /in/ZY4HY on line 9 NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/ZY4HY on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/ZY4HY on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/ZY4HY on line 2
Process exited with code 255.