php man page for pg_flush

PG_FLUSH(3)															       PG_FLUSH(3)

pg_flush - Flush outbound query data on the connection

SYNOPSIS
       mixed pg_flush (resource  $connection)

DESCRIPTION
       pg_flush(3) flushes any outbound query data waiting to be sent on the connection.

PARAMETERS
	      o $connection
		- PostgreSQL database connection resource.

RETURN VALUES
	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.

PHP Documentation Group 													       PG_FLUSH(3)