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run code in 200+ php & hhvm versions
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<?php function bar() { return null; } $x = bar() ?? 'default'; var_dump($x);
Output for 7.0.0 - 7.2.0
string(7) "default"
Output for 5.3.19 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/SFUET on line 8
Process exited with code 255.