Used with mysql_multi_query() to move the result set on one
function mysql_next_result( ?resource $link_identifier = NULL, ): int
resource$link_identifier = NULL- The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no such link is found, it will try to create one as if mysql_connect() was called with no arguments. If no connection is found or established, an E_WARNING level error is generated.
int- - 0 - Query succeeded, more results coming. -1 - Query succeeded, no more results coming. >0 - query failed, value is error code.