(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.
connection
PostgreSQL database connection resource.
Returns 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 or FALSE
on failure.