Makes a copy of a file. Returns
TRUE if the copy succeeded,
FALSE otherwise.
注: As of PHP 4.3.0, both source and dest may be URLs if the "fopen wrappers" have been enabled. See fopen() for more details. If dest is an URL, the copy operation may fail if the wrapper does not support overwriting of existing files.
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See also move_uploaded_file(), rename(),
and the section of the manual about handling file uploads.