If you want to chroot a sftp-user to the home dir, then you must do a “chmod 701 ..” while in the home dir.
Or else these two guides won’t do any good at all!!
http://www.serverubuntu.it/SFTP-chroot
http://www.cyberciti.biz/tips/vsftp-chroot-users-limit-to-only-their-home-directory.html
Here it helps me to determine exactly where an MySQL error has occured.
Really helpful when having several thousands lines of code in each file.
private function sqlerror()
{
$debug = debug_backtrace();
return "<pre>" . $debug[1]['file'] . "\nRow: " . $debug[1]['line'] . "\n\n" . mysql_error() . "</pre>";
}