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<?php $z['a'] = 'a'; var_dump ($z['b']); var_dump ($z['b'] ?? null); var_dump ($z['b'] ?? 'b');
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "b" in /in/q1Gkv on line 6 NULL NULL string(1) "b"

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