查找网站搬迁错误Unable to connect to your database server using the provided settings

http://www.php230.com/codeigniter-appear-unable-to-connect-to-your-database-server-using-the-provided-settings-error.html

解决过程：

在config/database.php最后加上如下代码进行调试。

echo '<pre>';

 print_r($db['default']);
echo '</pre>';

echo 'Trying to connect to database: ' .$db['default']['database'];
$dbh=mysql_connect
(
$db['default']['hostname'],
$db['default']['username'],
$db['default']['password'])
or die('Cannot connect to the database because: ' . mysql_error());
mysql_select_db ($db['default']['database']);

echo '<br />   Connected OK:'  ;

die( 'file: ' .__FILE__ . '--> Line: ' .__LINE__);

输出后发现 ， 提示：不能连接数据库。  改正确后， hostname 应该是远程数据库地址