<?php// Define path to root of PHPMATH library.define("PHPMATH", "/home/php/math");  // Define MySQL connection string in PEAR:DB format. You will need // to set up a database with login parameters and configure this // connection string before the database-aware classes will work.define("MYSQL", "mysql://myuser:mypass@localhost/mydb");// Set up database connection.require_once 'DB.php';$db =& DB::connect(MYSQL);if (DB::isError($db)) {  echo 'Standard Message: ' . $db->getMessage() . "<br />";  echo 'DBMS/User Message: ' . $db->getUserInfo() . "<br />";  echo 'DBMS/Debug Message: ' . $db->getDebugInfo() . "<br />";  exit;}$db->setFetchMode(DB_FETCHMODE_ASSOC);// Start a named session.session_name("entropy");session_start();?>