February 12, 2011 
Definition:
function wp_delete_post_revision( $revision_id ) {}
Deletes a revision.
Deletes the row from the posts table corresponding to the specified revision.
Parameters
- int|object $revision_id: Revision ID or revision object.
Return values
returns:Null or WP_Error if error, deleted post if success.
Defined actions
- wp_delete_post_revision
do_action( 'wp_delete_post_revision', $revision->ID, $revision );
Source code
function wp_delete_post_revision( $revision_id ) {
if ( !$revision = wp_get_post_revision( $revision_id ) )
return $revision;
$delete = wp_delete_post( $revision->ID );
if ( is_wp_error( $delete ) )
return $delete;
if ( $delete )
do_action( 'wp_delete_post_revision', $revision->ID, $revision );
return $delete;
}
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A HitchHackers guide through WordPress 
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