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<?php error_reporting(E_ALL); echo $_GET['aaa']; $user = $_GET['xxx'] ?? 'nobody'; var_dump($user); $null = ''; var_dump($null??'haha'); $arr = ['a' => 1]; echo $arr[0]; var_dump($arr['b'] ?? 'bbbb');
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "aaa" in /in/lSEef on line 3 string(6) "nobody" string(0) "" Warning: Undefined array key 0 in /in/lSEef on line 9 string(4) "bbbb"

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