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 explode, split and wordwrap.