(no version information, might be only in CVS)
DomNode->previous_sibling -- Returns the previous sibling of nodeThis function returns the previous sibling of the current node. If there is no previous sibling it returns false (< 4.3) or null (>= 4.3). You can use this function to iterate over all children of a node as shown in the example.
See also DomNode_next_sibling().