Introduction - If you have any usage issues, please Google them yourself
The idea of the Base64 encoding 64 basic ASCII character data re-encoding. It will need the encoded data is split into an array of bytes. For a group of three bytes. Order 24, then 24 data divided into four groups, namely, six in each group. Before the highest bit of each to fill two 0 to kick in a byte. So put a 3-byte data for a group of re-encoded into four bytes. When the number of bytes of data to be encoded is not an integer multiples, that is in the packet when the last group of less than 3 bytes. Then fill in the final set 1-2 0 bytes. And at the end after the completion of the last coding to add 1-2 " =" .