(PHP 4 >= 4.2.0)
domxml_xmltree — Creates a tree of PHP objects from an XML document
   The function parses the XML document in str and
   returns a tree PHP objects as the parsed document.
  
This function is isolated from the other functions, which means you cannot access the tree with any of the other functions. Modifying it, for example by adding nodes, makes no sense since there is currently no way to dump it as an XML file.
However this function may be valuable if you want to read a file and investigate the content.
strThe contents of the XML file.
Returns a tree of Dom objects starting by a DomDocument.