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do_action

Execute functions hooked on a specific action hook.This function invokes all functions attached to action hook $tag. It is possible to create new action hooks by simply calling this function, specifying the name of the new hook using the $tag parameter.

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download_url

Downloads a url to a local temporary file using the WordPress HTTP Class.Please note, That the calling function must unlink() the file.

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domain_exists

Check whether a blogname is already taken.Used during the new site registration process to ensure that each blogname is unique.

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