chunk_split Split a string into smaller chunks stringchunk_split stringbody intchunklen stringend 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 (defaults to "\r\n") every chunklen characters (defaults to 76). It returns the new string leaving the original string untouched. ]]> See also str_split, explode, split, wordwrap and RFC 2045.