This function has been deprecated. That means it has been replaced by a new function or is no longer supported, and may be removed from future versions. All code that uses this function should be converted to use its replacement if one exists. See also
Use any of these functions
This function is not defined on any WordPress core file as of v3.1 and should therefore be considered deprecated. It was added with the integration of WPMU with WordPress core in version 3.0, but was not used in any core files, so was removed in 3.1.
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