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run code in 150+ php & hhvm versions
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<?php var_dump(empty($test)); var_dump(isset($test) && is_null($test)); // undefined
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(true) bool(false)
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/g7AEo on line 3
Process exited with code 255.