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run code in 200+ php & hhvm versions
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<?php $test = $_GET['test'] ?? false; var_dump($test);
based on rD0gs
Output for 7.0.0 - 7.2.0
bool(false)
Output for 5.3.20 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/OJXd8 on line 3
Process exited with code 255.