bug#17360: base64 bug of result ending founded

[Алексей]

I take some difference of results base64 command and base64 php function

*echo "111111" | base64*
give result
*MTExMTExCg==*


but base64 php function give result
*MTExMTEx*


I take incorrect result: *MTExMTExCg==*
because the end *Cg==* are wrong