Bad php codes can cause this(Error:Connection timed out) type of errors in FTP?

Sometimes when i am trying to connect to my server through filezilla i am getting this error at the same time my site and phpmyadmin is also down and getting errors like this mysql error: MySQL server has gone away or some times too many connections. It was working fine for last two days. 2 days before i altered tables in my database added some code in my .inc files (ie, php code) after that only i am having this problem. But some times i can connect to server and both my site and phpadmin is also loaded. I would like to know whether bad php codes can cause this(Error:Connection timed out) type of errors in FTP? Please help me..

SOLVED

Problem was with the server and they have corrected it. Thanks a lot to all of you who responded to my question

Solution

Seems like your code is establishing too many MySQL connections, can you add the code to your question to confirm? (Do you have a DB connection in a loop by any chance?)

Regarding post-rollback errors, as you have not stated what you have tried, here is a slew of possible solutions.

MySQL #2002 forum post - A few possible solutions here.
linuxquestions forum post - (setting 'socket = /var/lib/mysql/mysql.sock' in my.cf)
'Solve: Can’t connect to local MySQL server through socket /tmp/mysql.sock'

The basic problem is most likely that you do not have the socket set correctly, check where the .sock is and what is currently set to in your settings.

Aside: You could go for a clean install of LAMP / XAMPP / whatever, may end up being quicker if possible assuming you can't fix the issue itself.