Is swoole multi-process or multi-threaded?

Since the PHP language does not support multi-threading, Swoole uses multi-process mode. There is process memory isolation in multi-process mode. When global variables and super-global variables are modified in the working process, it will be invalid in other processes. (Recommended Learning: SWOOLE Video Tutorial )

设置worker_num=1时，不存在进程隔离，可以使用全局变量保存数据

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$fds = array();
$server->on('connect', function ($server, $fd){
    echo "connection open: {$fd}\n";
    global $fds;
    $fds[] = $fd;
    var_dump($fds);
});

$ FDS Although it is a global variable, it is only currently Valid within the process. The bottom layer of the Swoole server will create multiple Worker processes. The value printed in var_dump($fds) only contains partial connected fds.

The corresponding solution is to use external storage services:

数据库，如：MySQL、MongoDB
缓存服务器，如：Redis、Memcache
磁盘文件，多进程并发读写时需要加锁

Ordinary database and disk file operations have a lot of IO waiting time. Therefore it is recommended to use:

Redis 内存数据库，读写速度非常快
/dev/shm 内存文件系统，读写操作全部在内存中完成，无IO消耗，性能极高
除了使用存储之外，还可以使用共享内存来保存数据

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