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<?php $a = NULL; $c = ''; print $a ?? '1b'; print "\n"; print $a ?: '2b'; print "\n"; print $c ?? '1d'; print "\n"; print $c ?: '2d'; print "\n"; print $e ?? '1f'; print "\n"; print $e ?: '2f';
Output for git.master, git.master_jit, rfc.property-hooks
1b 2b 2d 1f Warning: Undefined variable $e in /in/ZBAa1 on line 21 2f

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