thinkphp3.2开发排错一例——当/index.php的值变化后，需要删除缓存~runtime.php文件
经过是这样的：
在根目录下建立了一个文件夹weixin，之前通过www.domain.com/weixin访问，后来想改成二级域名weixin.domain.com访问，但通过U方法生成的路径中仍含有weixin/，通过输出/index.php的值发现也带weixin/，删除缓存~runtime.php文件后解决问题
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