PHP マニュアル: Copies out specified number of bytes from the front of the buffer

説明

public int EventBuffer::copyout( string &$data , int $max_bytes )

Behaves just like EventBuffer::read , but does not drain any data from the buffer. I.e. it copies the first max_bytes bytes from the front of the buffer into data . If there are fewer than max_bytes bytes available, the function copies all the bytes there are.

パラメータ

data: Output string.
max_bytes: The number of bytes to copy.

戻り値

Returns the number of bytes copied, or -1 on failure.

参考

EventBuffer::read
EventBuffer::appendFrom