# EventBuffer::copyout

(PECL event >= 1.2.6-beta)

EventBuffer::copyout — Copies out specified number of bytes from the front of the buffer

### 说明

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

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.

### 参数

`data`

  Output string.

`max_bytes`

  The number of bytes to copy.

### 返回值

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

### 参见

- 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

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