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<?php var_dump(array_diff( [ 'q1' => true, 'q2' => true, 'q3' => false, 'q4' => false, ], [ 'q1' => false, 'q2' => false, 'q3' => false, 'q4' => false, ] ));

This is an error 500

Value for `_results` contains invalid data `array`


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