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Is there a way in PHP how to determine an absolute path given a relative path without actually resolving symlinks? Something like the realpath function but without symlink resolution.
Or alternatively, is there some easy way to check whether user (who uses my browsing PHP script to view files) did not accidentally step out of Apache virtual host's home directory? (or disallow him to use the nasty . and .. in paths)
Thanks!
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If the path starts with a single component separator, the drive from the current directory is applied. For example, if the file path is \utilities and the current directory is C:\temp\ , normalization produces C:\utilities .
In simple words, an absolute path refers to the same location in a file system relative to the root directory, whereas a relative path points to a specific location in a file system relative to the current directory you are working on.
Symbolic links can either be absolute or relative links. Absolute links are links that specify each portion of the path name; relative links are determined relative to where relative–link specifiers are in a specified path.
I don't know PHP native solution for this, but one nice absolute path implementation is here: http://www.php.net/manual/en/function.realpath.php#84012
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