XML_ErrorString   148 ext/xml/expat_compat.h PHP_XML_API const XML_Char *XML_ErrorString(int);
XML_ErrorString  1491 ext/xml/xml.c  	str = (char *)XML_ErrorString((int)code);
XML_ErrorString   725 ext/xmlrpc/libxmlrpc/xml_element.c          const char * error_str = XML_ErrorString(err_code);