dirname in php may not be what you think it to be: given a full path name of a file, return its directory part. In fact, dirname(pathname) returns the parent directory of the parameter, wether it is a file or a directory, i.e.
dirname("C:\\dir\\file.txt") returns C:\dir,
dirname("C:\\dir") returns C:\, NOT C:\dir,
dirname("C:\\dir\\") also returns C:\ ,
note that,
dirname("C:\\") returns C:\
dirname("C:") returns C:
i.e., the dirname of root is the drive name. dirname("C") returns .(“C” is considered as a file under the current folder which is denoted by .)
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