File: wp-includes/revision.php
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function_wp_put_post_revision()
Inserts post data into the posts table as a post revision.
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function_set_preview()
Sets up the post object for preview based on the post autosave.
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function_wp_post_revision_fields()
Determines which fields of posts are to be saved in revisions.
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Filters the list of fields saved in post revisions.
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functionwp_save_post_revision()
Creates a revision for the current version of a post.
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Filters whether the post has changed since the latest revision.
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functionwp_get_post_autosave()
Retrieves the autosaved data of the specified post.
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functionwp_is_post_revision()
Determines if the specified post is a revision.