(no version information, might be only in CVS)
This function is similar to
domdocument_get_elements_by_tagname() but searches for an
element with a given id. According to the DOM standard this
requires a DTD which defines the attribute ID to be of type
ID, though the current implementation simply does an xpath
search for "//*[@ID = '%s']". This does not comply to the DOM
standard which requires to return null if it is not known
which attribute is of type id. This behaviour is likely to be
fixed, so do not rely on the current behaviour.
See also
domdocument_get_elements_by_tagname()