$dbconn = pg_connect("dbname=publisher") or die("Could not connect");

  if (!pg_connection_busy($dbconn)) {
      pg_send_query($dbconn, "select * from authors; select count(*)
from authors;");

  $res1 = pg_get_result($dbconn);
  echo "First call to pg_get_result(): $res1\n";
  $rows1 = pg_num_rows($res1);
  echo "$res1 has $rows1 records\n\n";

  $res2 = pg_get_result($dbconn);
  echo "Second call to pg_get_result(): $res2\n";
  $rows2 = pg_num_rows($res2);
  echo "$res2 has $rows2 records\n";

There's the code example from that same link.  You may have executed
the queries asynchronously, but the process of the results are still
serial.  Let's face it, all of our processing of queries are not a
simple echo.  We iterate/loop through the results and display them in
the desired format.  Having execute the query and the processing of
the result in threads/parallel, you get the real performance boost
which I've been trying to convey the concept of serial versus

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