(PHP 4 >= 4.3.0, PHP 5)
pg_ping — Ping database connection
$connection
      )
     pg_ping() ping database connection, try to
     reconnect if it is broken. It returns TRUE if connection is
     alive, otherwise FALSE.
    
See also pg_connection_status() and pg_connection_reset().
Example #1 PostgreSQL fetch array
<?php 
$conn = pg_pconnect ("dbname=publisher");
if (!$conn) {
    echo "An error occured.\n";
    exit;
}
if (!pg_ping($conn))
    die("Connection is broken\n");
?>