Why should base64_encode fail?

Description

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.

Return Values

The encoded data, as a string or FALSE on failure.

The above quote taken from PHP.net claims that the function may fail. But for what reason(s)?

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