This function returns a new instance of class DomEntityReference. The content of the entity
reference is the value of the passed parameter. This node
will not show up in the document unless it is inserted with
e.g. domnode_append_child().
The return value is
FALSE if an error occured.
See also domnode_append_child(),
domdocument_create_element(), domdocument_create_text(), domdocument_create_cdata_section(), domdocument_create_processing_instruction(),
domdocument_create_attribute(), and
domnode_insert_before().