# swoole_buffer::write
向缓存区的任意内存位置写数据。此函数可以直接写内存。所以使用务必要谨慎，否则可能会破坏现有数据。
~~~
swoole_buffer->write(int $offset, string $data)
~~~
- $offset 偏移量
- $data 写入的数据
> $data不能超过缓存区的最大尺寸。
write方法不会自动扩容
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