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<?php $a = 1; var_dump(['a' => $a, 'b' => $b]); var_dump(compact('a', 'v'));
Output for git.master_jit, git.master
Warning: Undefined variable $b in /in/pHACp on line 5 array(2) { ["a"]=> int(1) ["b"]=> NULL } Warning: compact(): Undefined variable $v in /in/pHACp on line 6 array(1) { ["a"]=> int(1) }

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