3v4l.org

run code in 200+ php & hhvm versions
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<?php $success = $_GET['success'] ?? false; var_dump ($success);
based on QNjII
Output for 7.0.0 - 7.2.0
bool(false)
Output for 5.3.18 - 5.6.21
Parse error: syntax error, unexpected '?' in /in/YVgC2 on line 2
Process exited with code 255.