(no version information, might be only in CVS)
DOMDocument->createProcessingInstruction() -- Creates new PI node
Description
class 
DOMDocument { 
DOMProcessingInstruction 
createProcessingInstruction ( string target [, string data] )
}
   This function creates a new instance of class
   DOMProcessingInstruction. This node will not show up in the document unless 
it is inserted with e.g. DOMNode->appendChild().