During this parsing process, the elements and data in the configuration file are converted into key-value pairs, similar to that found in a PHP associative array.
解析过程中，配置文件中的元素和数据转化成类似PHP关联数组的键-值对。
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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.