This function checks to ensure that the file designated
by filename is a valid
upload file (meaning that it was uploaded via PHP's HTTP POST
upload mechanism). If the file is valid, it will be moved to
the filename given by
destination.
If filename is not a
valid upload file, then no action will occur, and move_uploaded_file() will return FALSE.
If filename is a valid
upload file, but cannot be moved for some reason, no action
will occur, and move_uploaded_file()
will return FALSE.
Additionally, a warning will be issued.
This sort of check is especially important if there is
any chance that anything done with uploaded files could
reveal their contents to the user, or even to other users on
the same system.
注: 當安全模式開啟,PHP會檢查執行的腳本和 要操作的檔案或目錄是否有相同的UID(擁有者)。
注: move_uploaded_file() is not affected by the normal safe mode UID-restrictions. This is not unsafe because move_uploaded_file() only operates on files uploaded via PHP.
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See also is_uploaded_file(), and the section
Handling file uploads
for a simple usage example.