You define your database format with three tables, and proceed to query them, showing that you can both emulate traditional SQL SELECT, and also provide an associative lookup.
定义一个具有3个表的数据库，然后对它们进行查询，既可以模仿传统的SQLSELECT，也可以进行关联查找。
It USES the SimpleXML module to read and parse the XML configuration file into a PHP object, and then creates an associative array mapping each defined chain to its name for easy lookup.
它使用SimpleXML模块读取XML配置文件，并将其解析为php对象，然后，创建一个关联数组，将每个定义的链映射到其名称，以便于查找。
It USES the SimpleXML module to read and parse the XML configuration file into a PHP object, and then creates an associative array mapping each defined chain to its name for easy lookup.
它使用SimpleXML模块读取XML配置文件，并将其解析为php对象，然后，创建一个关联数组，将每个定义的链映射到其名称，以便于查找。
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