(PECL event >= 1.2.6-beta)
EventBuffer::drain — Removes specified number of bytes from the front of the buffer without copying it anywhere
Behaves as EventBuffer::read() , except that it does not copy the data: it just removes it from the front of the buffer.
len
The number of bytes to remove from the buffer.
Retorna true
em caso de sucesso ou false
em caso de falha.