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<?php $arr0 = new ArrayObject(['a' => 'A']); $arr1 = new ArrayObject(['x' => 'X']); var_export($arr0 + $arr1);
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
Fatal error: Uncaught TypeError: Unsupported operand types: ArrayObject + ArrayObject in /in/v1GqI:5 Stack trace: #0 {main} thrown in /in/v1GqI on line 5
Process exited with code 255.

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