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update_attached_file

Update attachment file path based on attachment ID.Used to update the file path of the attachment, which uses post meta name ‘_wp_attached_file’ to store the path of the attachment.

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unzip_file

Unzips a specified ZIP file to a location on the Filesystem via the WordPress Filesystem Abstraction.Assumes that WP_Filesystem() has already been called and set up. Does not extract a root-level __MACOSX directory, if present.

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untrailingslashit

Removes trailing slash if it exists.The primary use of this is for paths and thus should be used for paths. It is not restricted to paths and offers no specific path support.

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unstick_post

Unstick a post.Sticky posts should be displayed at the top of the front page.

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