EventBuffer::drain

(PECL event >= 1.2.6-beta)

EventBuffer::drain — Removes specified number of bytes from the front of the buffer without copying it anywhere

public EventBuffer::drain( int $len ): bool

Behaves as EventBuffer::read() , except that it does not copy the data: it just removes it from the front of the buffer.

成功时返回 true，或者在失败时返回 false。

EventBuffer::read() - Read data from an evbuffer and drain the bytes read
EventBuffer::appendFrom() - Moves the specified number of bytes from a source buffer to the end of the current buffer