http://kr.php.net/manual/en/function.wordwrap.php
http://kr.php.net/manual/en/function.chunk-split.php

http://kr.php.net/manual/en/function.wordwrap.php/?http://kr.php.net
/manual/en/function.wordwrap.php
wordwrap

http://kr.php.net/manual/en/function.wordwrap.php?fobarddddddddddddd
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(PHP 4 >= 4.0.2)

wordwrap --  Wraps a string to a given number of characters using a string break
character. 
Description
string wordwrap ( string str [, int width [, string break [, boolean cut]]])


Returns a string with str wrapped at the column number specified by the optional
width parameter. The line is broken using the (optional) break parameter. 

wordwrap() will automatically wrap at column 75 and break using '\n' (newline) if
width or break are not given. 

If the cut is set to 1, the string is always wrapped at the specified width. So if
you have a word that is larger than the given width, it is broken apart. (See second
example). 

Note: The optional cut parameter was added in PHP 4.0.3