Creates a file with a unique filename in the specified
directory. If the directory does not exist, tempnam() may generate a file in the system's
temporary directory, and return the name of that.
Prior to PHP 4.0.6, the behaviour of the tempnam() function was system dependent. On
Windows the TMP environment variable will override the dir parameter, on Linux the
TMPDIR environment variable has precedence, while SVR4 will
always use your dir
parameter if the directory it points to exists. Consult your
system documentation on the tempnam(3) function if in
doubt.
Returns the new temporary filename, or the FALSE string on failure.
注: This function's behavior changed in 4.0.3. The temporary file is also created to avoid a race condition where the file might appear in the filesystem between the time the string was generated and before the the script gets around to creating the file. Note, that you need to remove the file in case you need it no more, it is not done automatically.