(PECL event >= 1.6.0)
EventBuffer::appendFrom — Moves the specified number of bytes from a source buffer to the end of the current buffer
Moves the specified number of bytes from a source buffer to the end of the current buffer. If there are fewer number of bytes, it moves all the bytes available from the source buffer.
buf
    Source buffer.
len
    Returns the number of bytes read.
| Version | Description | 
|---|---|
| 1.6.0 | Renamed EventBuffer::appendFrom()(the old method name) to EventBuffer::appendFrom(). |