(PHP 3>= 3.0.6, PHP 4 >= 4.0.0)
chunk_split -- Split a string into smaller chunks
Description
string chunk_split (string string [, int 
       chunklen [, string 
       end]])
     Can be used to split a string into smaller chunks which is useful
     for e.g. converting base64_encode output to
     match RFC 2045 semantics. It inserts every
     chunklen (defaults to 76) chars the string
     end (defaults to "\r\n").  It returns the
     new string leaving the original string untouched.
     
Example 1. chunk_split() example 
# format $data using RFC 2045 semantics
$new_string = chunk_split(base64_encode($data));
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     This function is significantly faster than
     
ereg_replace().
     
Note: 
       This function was added in 3.0.6.