(PHP 4 >= 4.2.0, PHP 5)
pg_connection_busy — Get connection is busy or not
$connection
   )pg_connection_busy() determines whether or not a connection is busy. If it is busy, a previous query is still executing. If pg_get_result() is used on the connection, it will be blocked.
connectionPostgreSQL database connection resource.
    Returns TRUE if the connection is busy, FALSE otherwise.
   
Example #1 pg_connection_busy() example
<?php
  $dbconn = pg_connect("dbname=publisher") or die("Could not connect");
  $bs = pg_connection_busy($dbconn);
  if ($bs) {
      echo 'connection is busy';
  } else {
     echo 'connection is not busy';
  }
?>