PHP Manual . Prev . Next . PHP 3 <= 3.0.18, PHP 4 >= 4.0.0) base64_encode -- Encodes data with MIME base64 . string base64_encode ( string data) . base64_encode() returns data encoded with base64. This encoding is designed to make binary data survive transport through transport layers that are not 8-bit clean, such as mail bodies. Base64-encoded data takes about 33% more space than the original data. See also: base64_decode() , chunk_split() , RFC2045 section 6.8. ...