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DomNode->previous_sibling

Returns the previous sibling of node ()
domelement DomNode->previous_sibling ( )

This 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().