md5() function convert the string into hash of a string (encripted format).
string base64_encode ( string $data )
Encodes the given data 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.
base64_decode ? Decodes data encoded with MIME base64
Hash
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