Updates a named option/value pair to the options database table.

This function may be used in place of add_option, although it is not as flexible. update_option will check to see if the option already exists. If it does not, it will be added with add_option('option_name', 'option_value'). Unless you need to specify the optional arguments of add_option(), update_option() is a useful catch-all for both adding and updating options.


update_option() (Codex)

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