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描述
接受一个或多个列，包括或不包括排序顺序（ASC/DESC）。例如：“column_1”、“column_1、column_2”、“column_1 ASC、column_2 DESC”等。
也接受“RAND()”。
参数
- $orderby
-
(string) (必填) 待验证的Order by子句。
返回
(string|false) 如果有效，则返回$orderby，否则返回false。
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