base64 encoded data

[sallen]

I've run across a project where the client is randomly base64_encoding various columns before inserting/updating them in a mySQL database. My project requires me to query the table and export the data to XML.

Does anyone know of a quick method of determining if a string is base64 encoded?

Thanks

[Anon]

This sucks as i forgot the right functions, but itll work:
$length = strlen($data);
if($data[($length)] == "=" AND $data[($length - 1)] == "=")
{
data's encodes
}
else
{
datas Not
}