# swoole_process->pop
从队列中提取数据。
~~~
string swoole_process->pop(int $maxsize = 8192);
~~~
- $maxsize表示获取数据的最大尺寸，默认为8192
- 操作成功会返回提取到的数据内容，失败返回false
- 如果队列中没有数据，pop()方法会阻塞等待
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