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$config_overwrite
配置覆盖变量

If set to true, variables read in from config files will overwrite each other. Otherwise, the variables will be pushed onto an array. This is helpful if you want to store arrays of data in config files, just list each element multiple times. true by default.
如果设该变量为真,则从配置文件中读取出来的变量将会互相覆盖.否则,变量将会放到一个数组中.如果你想把配置文件中的数据存储到数组里,这种方式是很有用的,仅仅列出每个元素多次就可以了.默认情况下,设为真.