 PS... Buffered...  Warning: PDO::query(): SQLSTATE[HY000]: General error: 0000 Cannot execute queries while other unbuffered queries are active.  Consider using PDOStatement::fetchAll().  Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute. in %s on line %d in = 0 -> id = 0 (integer) / label = 'a' (string) in = 0 -> id = 0 (integer) / label = 'b' (string) Unbuffered...  Warning: PDO::query(): SQLSTATE[HY000]: General error: 0000 Cannot execute queries while other unbuffered queries are active.  Consider using PDOStatement::fetchAll().  Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute. in %s on line %d in = 0 -> id = 0 (integer) / label = 'a' (string) in = 0 -> id = 0 (integer) / label = 'b' (string) 