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<?php $arr = ['foo' => 'bar']; $newArr = []; foreach (['foo', 'test'] as $key) { $arr[$key] ?? $newArr[] = $arr[$key]; } var_dump($newArr);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "test" in /in/qmXCV on line 7 array(1) { [0]=> NULL }

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