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<?php $a = null; print $a ?? 'b'; print "\n"; print $a ?: 'b'; print "\n"; print $c ?? 'a'; print "\n"; print $c ?: 'a'; print "\n"; $b = array('a' => null); print $b['a'] ?? 'd'; print "\n"; print $b['a'] ?: 'd'; print "\n"; print $b['c'] ?? 'e'; print "\n"; print $b['c'] ?: 'e'; print "\n";
Output for git.master, git.master_jit, rfc.literals
b b a Warning: Undefined variable $c in /in/McavC on line 14 a d d e Warning: Undefined array key "c" in /in/McavC on line 28 e

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