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run code in 150+ php & hhvm versions
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<?php $test = "asd"; $cols = ['asdasda', 'asdasdasd']; $cols = array_filter($cols, function ($col) use ($test) { print $test; return true; });
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
asdasd
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/PnZ0J on line 3
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/PnZ0J on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/PnZ0J on line 3
Process exited with code 255.