swoole1.7.5提供了一个swoole_buffer类，让PHP开发者可以像C一样直接读写内存，提升程序的性能，又不用担心内存越界。swoole_buffer会检测offset。
swoole_buffer申请的内存并非共享内存，所以无法在多个进程间被共享
- swoole_buffer->$length，当前数据的长度
- swoole_buffer->$capacity，当前缓存区的容量
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