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Attempts to rename oldname to newname.
Returnerar TRUE vid framgång eller FALSE vid fel.
Not: Prior to PHP 4.3.3, rename() could not rename files across partitions on *nix based systems.
Not: As of PHP 5.0.0 rename() can also be used with some URL wrappers. Refer to Appendix J for a listing of which wrappers support rename().
Not: The wrapper used in oldname MUST match the wrapper used in newname.
Not: The context parameter was added as of PHP 5.0.0.
See also copy(), unlink(), and move_uploaded_file().
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