file access in php security.

In php we have doc_root,user_dir and open_basedir option to control file access using php.If we Specify the doc_root,then every request for opening a file will be checked against the doc_root.If it is not under the doc_root, the request is discarded.Another one is user_dir. user_dir is used with respect to doc_root.If a user_dir is specified then a request is checked whether the file is in the doc_root and then is it in the user_dir. open_basedir controls which files will be opened using php. we must use a trailing slash after the file name to be more secure.
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