An empty or null array is not a valid return value.

空的或null数组不是一个有效的返回值。

youdao

The last example, (), is used to refer to the empty, or null, list.

最后一个示例 () 用来表示一个空列表。

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This parameter can be an empty string or NULL, if defaults should be picked.

如果应该使用默认值，那么这个参数可以是空字符串或NULL。

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The company notes that based on current foreign-exchange rates, particularly with the euro, it expects foreign-currency translation to have a negative impact on earnings per share for the full year, even though the currency impact in the second quarter is expected to be minimal or null.

FORBES

The company notes that based on current foreign-exchange rates, particularly with the euro, it expects foreign currency translation to have a negative impact on earnings per share for the full year, even though the currency impact in the second quarter is expected to be minimal or null.

FORBES: Magazine Article

Unless licensed or authorized pursuant to this order, or Executive Order 13159 of June 21, 2000, any attachment, judgment, decree, lien, execution, garnishment, or other judicial process is null and void with respect to any property or interest in property blocked pursuant to this order.

WHITEHOUSE: Executive Order--Russian Highly Enriched Uranium