xml_set_external_entity_ref_handler Set up external entity reference handler &reftitle.description; truexml_set_external_entity_ref_handler XMLParserparser callablestringnullhandler Sets the external entity reference handler function for the XML parser parser. &reftitle.parameters; &xml.parser.param; handler &xml.handler.description; The signature of the handler must be: boolhandler XMLParserparser stringopen_entity_names stringfalsebase stringsystem_id stringfalsepublic_id &xml.handler.parser.param; open_entity_names A space-separated list of the names of the entities that are open for the parse of this entity (including the name of the referenced entity). base This is the base for resolving the system identifier (system_id) of the external entity. system_id The system identifier as specified in the entity declaration. public_id The public identifier as specified in the entity declaration, or an empty string if none was specified; the whitespace in the public identifier will have been normalized as required by the XML spec. The handler should return &true; if the entity was handled, &false; otherwise. When returning &false; the XML parser will stop parsing and xml_get_error_code will return XML_ERROR_EXTERNAL_ENTITY_HANDLING. &reftitle.returnvalues; &return.true.always; &reftitle.changelog; &Version; &Description; &xml.changelog.handler-param; &xml.changelog.parser-param; 7.3.0 The return value of the handler is no longer ignored if the extension has been built against libxml. Formerly, the return value has been ignored, and parsing did never stop.