(PHP 5 >= 5.6.0)
pg_flush — Flush outbound query data on the connection
pg_flush() flushes any outbound query data waiting to be sent on the connection.
PostgreSQL database connection resource.
TRUE if the flush was successful or no data was waiting to be flushed, 0 if part of the pending data was flushed but more remains или
FALSE в случае возникновения ошибки.