http://aspn.activestate.com/ASPN/Mail/Message/pear-general/1265596请参考这页的解决方法
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For some reason my web host doesn't have /usr/share/pear/ in their
php.ini include path so I added it in my script like so:ini_set('include_path',ini_get('include_path') . ':/usr/share/pear/');
require_once('DB.php');All fixed! Thank you for your help everyone.