(PHP 4, PHP 5)
chunk_split — Split a string into smaller chunks
$body
   [, int $chunklen = 76
   [, string $end = "\r\n"
  ]] )
   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 end every 
   chunklen characters.
  
bodyThe string to be chunked.
chunklenThe chunk length.
endThe line ending sequence.
Returns the chunked string.
Example #1 chunk_split() example
<?php
// format $data using RFC 2045 semantics
$new_string = chunk_split(base64_encode($data));
?>