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<?php $arr_database = array("V1", "V2", "V5", "V6", "V7", "V10"); $arr_custom = array("V1", "V2", "V3", "V4", "V5", "V6", "V7", "V8", "V9", "V10"); $arr_output = array_diff($arr_custom, $arr_database); echo json_encode($arr_output);

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