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run code in 200+ php & hhvm versions
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<?php $array = array( 'test' => 'aaa', ); echo $array['test'] ?? 'nope';
Output for 7.0.0 - 7.2.0
aaa
Output for 5.3.18 - 5.6.21
Parse error: syntax error, unexpected '?' in /in/iv74G on line 7
Process exited with code 255.