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                            # SWOOLE\_KEEP建立TCP長連接
[TOC]
swoole\_client支持在`php-fpm/apache`中創建一個TCP長連接到服務器端。使用方法：

~~~
$client = new swoole_client(SWOOLE_SOCK_TCP | SWOOLE_KEEP);
$client->connect('127.0.0.1', 9501);

~~~

啟用`SWOOLE_KEEP`選項后，一個請求結束不會關閉`socket`，下一次再進行`connect`時會自動復用上次創建的連接。如果執行`connect`發現連接已經被服務器關閉，那么`connect`會創建新的連接。

## SWOOLE\_KEEP的優勢

*   `TCP`長連接可以減少`connect``3`次握手/`close``4`次揮手帶來的額外IO消耗
*   降低服務器端`close`/`connect`次數
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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