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<?php $a = ['a' => 'aa', 'b' => 'bb']; $a = ['a' => 'aaa', 'c' => 'cc']; var_dump($a + $b);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $b in /in/8DQV1 on line 6 Fatal error: Uncaught TypeError: Unsupported operand types: array + null in /in/8DQV1:6 Stack trace: #0 {main} thrown in /in/8DQV1 on line 6
Process exited with code 255.

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