Anonymous (24-Apr-2010 05:43)

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The mysqli_close() function and object method only remove the ability to use the mysql object again in the script, essentially on the surface only nulling out all object parameters.
過程化的mysqli_close()函數(shù)和面向?qū)ο蟮姆椒ㄕ{(diào)用只是不讓用戶在此后的腳本中再使用mysql對(duì)象，基本上只在表面上歸零所有對(duì)象參數(shù)

At least with PHP5.3.2 and Windows connecting by tcp, this differs by the old mysql_close() function in that it does not actually close out the tcp socket being used.? You should always use mysqli_kill() function before mysqli_close() to actually close and free up the tcp socket being used by PHP.? Garbage collection after script execution nor mysqli_close() do not kill the tcp socket on their own.? The socket would otherwise remain in 'wait' state for approximately 30 seconds, and any additional page loads/connection attempts would only add to the total number of open tcp connections.? This wait time does not appear to be configurable via PHP settings.
至少在利用windows的tcp連接的這個(gè)版本的php中，舊的函數(shù)并沒有真正的關(guān)閉正在被使用的tcp連接，你應(yīng)該總是在調(diào)用mysqli_close()前使用mysqli_kill()函數(shù)，確保釋放php正在使用的tcp套接字連接。腳本結(jié)束后執(zhí)行g(shù)c要么mysqli_close()是不會(huì)自己殺掉這個(gè)tcp連接的。這個(gè)tcp連接會(huì)保持大約30秒的等待狀態(tài)，期間任何頁面的加載或連接的嘗試都會(huì)增加連接的總數(shù)，而這個(gè)等待時(shí)間似乎在php的配置文件中是不能設(shè)置的
Also as of this version, mysqli created links cannot be "deactivated", and will continue to accumulate in process memory until the PHP server or process is restarted, essentially making mysqli.max_links = -1 required. 另外在這個(gè)版本中，mysqli創(chuàng)建的連接是不能被設(shè)置為無效的，而且連接會(huì)在這個(gè)進(jìn)程中積累，知道php服務(wù)器或者進(jìn)程重啟，所以可以設(shè)置mysqli.max_links = -1

轉(zhuǎn)載于:https://www.cnblogs.com/iLoveMyD/archive/2012/02/28/2370715.html

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