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run code in 200+ php & hhvm versions
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<?php $x = $_GET['value'] ?? false ?: 'Default'; var_dump($x);
based on i59jT
Output for 7.0.0 - 7.2.0
string(7) "Default"
Output for 5.3.20 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/hAirK on line 2
Process exited with code 255.