read_cb          1219 ext/mysqlnd/mysqlnd.c 											  enum_mysqlnd_send_query_type type, zval *read_cb, zval *err_cb)
read_cb           626 ext/mysqlnd/mysqlnd_ps.c MYSQLND_METHOD(mysqlnd_stmt, send_execute)(MYSQLND_STMT * const s, enum_mysqlnd_send_execute_type type, zval * read_cb, zval * err_cb)
read_cb           427 ext/mysqlnd/mysqlnd_structs.h typedef enum_func_status	(*func_mysqlnd_conn_data__send_query)(MYSQLND_CONN_DATA * conn, const char *query, unsigned int query_len, enum_mysqlnd_send_query_type type, zval *read_cb, zval *err_cb);