Dimension of code in AES128

Dimension of code AES128  128 battles. How many php symbols?

128 battles are 16 symbols, but not every bayt has a reading, which can be correctly shown in the row. For example, 11 is a vertical tabulation  it will be somewhat problematic to keep it as a line.
If you put the key on your own, you'll keep it in the form of a row, but you'll limit it to about 5 numerals on the bayte and the real length of the key is 80 bats.
If the key comes from outside, there may be symbols that cannot be read correctly by the user. Then there's a couple of options for a structured presentation:
 Keeping the key like the HEX line is 0011. 32 symbols out.
 Maintain the key in base64  then the length is 4/3 * 16 = 22 symbols.