3v4l.org

run code in 200+ php & hhvm versions
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<?php $array = [ 'test' => 1 ]; $first_index = $array['test'] ?? '';
Output for hhvm-3.15.4, 7.0.0 - 7.3.0alpha1
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/61HRF on line 7
Process exited with code 255.