(PHP 5 >= 5.6.0, PHP 7)
pg_flush — Flush outbound query data on the connection
pg_flush ( resource $connection ) : mixed
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.
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https://www.php.net/manual/en/function.pg-flush.php