How does one address someone entering a crazy long string from breaking the page

[WorldNews]

Hello,

In a Php generated page, how do you suggest that one should address the problem of users entering long strings, in a rather crazy fashion, from breaking the proper look (width) of the page?

For example take a look at this page:
http://www.dreamdates.com/new2/profile.php?mem=30

As you see in this example the user has entered very long (crazy) strings such as:
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
which have caused the page to go beyond its intended width and look bad.

ThanX,

P.S., This site is currently under development and still not live for public use.

[TheRaptor]

All I see in the example is this:

Notice: Undefined index: dd_user in /var/www/html/dreamdates.com/new2/profile.php on line 45
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1

[Cups]

PHP: wordwrap - Manual

[WorldNews]

Sorry, that error has been fixed.
It was due to having added code without taking into account that non-members can also access this page.
So you are good to chck out this page now
ThanX.

All I see in the example is this: