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<?php $foo = null; var_dump($foo ?? 'bar', $foo ?: 'bar'); $foo = false; var_dump($foo ?? 'bar', $foo ?: 'bar', $foo ?? 'bar' :: 'baz');
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.15
Parse error: syntax error, unexpected '?' in /in/Gsm5J on line 4
Process exited with code 255.

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