bool is_readable ( string filename )
如果由 filename 指定的文件或目录存在并且可读则返回 TRUE。
记住:PHP 只能以运行 webserver 的用户名(通常为 'nobody')来访问文件。不计入安全模式的限制。
这函数判断时要知道用户名,这个用户名从哪里可以知道呢?
回复讨论(解决方案)
就是apache的用?名,一般是www-data
打?/etc/apache2/apache2.conf
查找User 和 Group就知道了
楼上正解 有的是_www 有的就是Apache2

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