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<?php $x = ['a' => ['b' => 1], 'c' => '']; var_dump( $x['a']['b'] ?? 'not');
based on A5eqT
Output for hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0rc3
int(1)
Output for 5.6.30
Parse error: syntax error, unexpected '?' in /in/0irQ7 on line 5
Process exited with code 255.