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<?php $a = []; print $a ?? 'b1'; print "\n"; print $a ?: 'b2'; print "\n"; print $c ?? 'a1'; print "\n"; print $c ?: 'a2'; print "\n";
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Array to string conversion in /in/iCCa0 on line 5 Array b2 a1 Warning: Undefined variable $c in /in/iCCa0 on line 14 a2

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