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<?php $nonexistent = ''; $value = $nonexistent ?? 'default'; $value2 = !empty($nonexistent) ? $nonexistent : 'default' var_dump($value, $value2);
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.29, 5.6.8 - 5.6.13
Parse error: syntax error, unexpected '?' in /in/GOJlk on line 3
Process exited with code 255.

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