<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Memcache::addServer</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="Memcache Functions" HREF="ref.memcache.html"><LINK REL="PREVIOUS" TITLE="Memcache::add" HREF="function.memcache-add.html"><LINK REL="NEXT" TITLE="Memcache::close" HREF="function.memcache-close.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.memcache-add.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.memcache-close.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.Memcache-addServer" ></A >Memcache::addServer</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN117877" ></A ><P > (no version information, might be only in CVS)</P >Memcache::addServer -- Add a memcached server to connection pool</DIV ><DIV CLASS="refsect1" ><A NAME="AEN117880" ></A ><H2 >说明</H2 >bool <B CLASS="methodname" >Memcache::addServer</B > ( string host [, int port [, bool persistent [, int weight [, int timeout [, int retry_interval [, bool status [, callback failure_callback]]]]]]] )<BR ></BR ><P > <B CLASS="function" >Memcache::addServer()</B > adds a server to the connection pool. The connection, which was opened using <B CLASS="function" >Memcache::addServer()</B > will be automatically closed at the end of script execution, you can also close it manually with <B CLASS="function" >Memcache::close()</B >. You can also use the <B CLASS="function" >memcache_add_server()</B > function. </P ><P > When using this method (as opposed to <B CLASS="function" >Memcache::connect()()</B > and <B CLASS="function" >Memcache::pconnect()()</B >) the network connection is not established until actually needed. Thus there is no overhead in adding a large number of servers to the pool, even though they might not all be used. </P ><P > Failover may occur at any stage in any of the methods, as long as other servers are available the request the user won't notice. Any kind of socket or Memcached server level errors (except out-of-memory) may trigger the failover. Normal client errors such as adding an existing key will not trigger a failover. </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B > This function has been added to Memcache version 2.0.0. </P ></BLOCKQUOTE ></DIV ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN117920" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >host</CODE ></DT ><DD ><P > Point to the host where memcached is listening for connections. </P ></DD ><DT ><CODE CLASS="parameter" >port</CODE ></DT ><DD ><P > Point to the port where memcached is listening for connections. This parameter is optional and its default value is 11211. </P ></DD ><DT ><CODE CLASS="parameter" >persistent</CODE ></DT ><DD ><P > Controls the use of a persistent connection. Default to <TT CLASS="constant" ><B >TRUE</B ></TT >. </P ></DD ><DT ><CODE CLASS="parameter" >weight</CODE ></DT ><DD ><P > Number of buckets to create for this server which in turn control its probability of it being selected. The probability is relative to the total weight of all servers. </P ></DD ><DT ><CODE CLASS="parameter" >timeout</CODE ></DT ><DD ><P > Value in seconds which will be used for connecting to the daemon. Think twice before changing the default value of 1 second - you can lose all the advantages of caching if your connection is too slow. </P ></DD ><DT ><CODE CLASS="parameter" >retry_interval</CODE ></DT ><DD ><P > Controls how often a failed server will be retried, the default value is 15 seconds. Setting this parameter to -1 disables automatic retry. Neither this nor the <CODE CLASS="parameter" >persistent</CODE > parameter has any effect when the extension is loaded dynamically via <A HREF="function.dl.html" ><B CLASS="function" >dl()</B ></A >. </P ><P > Each failed connection struct has its own timeout and before it has expired the struct will be skipped when selecting backends to serve a request. Once expired the connection will be successfully reconnected or marked as failed for another <CODE CLASS="parameter" >retry_interval</CODE > seconds. The typical effect is that each web server child will retry the connection about every <CODE CLASS="parameter" >retry_interval</CODE > seconds when serving a page. </P ></DD ><DT ><CODE CLASS="parameter" >status</CODE ></DT ><DD ><P > Controls if the server should be flagged as online. Setting this parameter to <TT CLASS="constant" ><B >FALSE</B ></TT > and <CODE CLASS="parameter" >retry_interval</CODE > to -1 allows a failed server to be kept in the pool so as not to affect the key distribution algoritm. Requests for this server will then failover or fail immediatly depending on the <CODE CLASS="parameter" >memcache.allow_failover</CODE > setting. Default to <TT CLASS="constant" ><B >TRUE</B ></TT >, meaning the server should be considered online. </P ></DD ><DT ><CODE CLASS="parameter" >failure_callback</CODE ></DT ><DD ><P > Allows the user to specify a callback function to run upon encountering an error. The callback is run before failover is attemped. The function takes two parameters, the hostname and port of the failed server. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN117974" ></A ><H2 >返回值</H2 ><P > 如果成功则返回 <TT CLASS="constant" ><B >TRUE</B ></TT >,失败则返回 <TT CLASS="constant" ><B >FALSE</B ></TT >。 </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN117979" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN117982" ></A ><P ><B >例 1. <B CLASS="function" >Memcache::addServer()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /><br /></font><font color="#FF8000">/* OO API */<br /><br /></font><font color="#0000BB">$memcache </font><font color="#007700">= new </font><font color="#0000BB">Memcache</font><font color="#007700">;<br /></font><font color="#0000BB">$memcache</font><font color="#007700">-></font><font color="#0000BB">addServer</font><font color="#007700">(</font><font color="#DD0000">'memcache_host'</font><font color="#007700">, </font><font color="#0000BB">11211</font><font color="#007700">);<br /></font><font color="#0000BB">$memcache</font><font color="#007700">-></font><font color="#0000BB">addServer</font><font color="#007700">(</font><font color="#DD0000">'memcache_host2'</font><font color="#007700">, </font><font color="#0000BB">11211</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* procedural API */<br /><br /></font><font color="#0000BB">$memcache_obj </font><font color="#007700">= </font><font color="#0000BB">memcache_connect</font><font color="#007700">(</font><font color="#DD0000">'memcache_host'</font><font color="#007700">, </font><font color="#0000BB">11211</font><font color="#007700">);<br /></font><font color="#0000BB">memcache_add_server</font><font color="#007700">(</font><font color="#0000BB">$memcache_obj</font><font color="#007700">, </font><font color="#DD0000">'memcache_host2'</font><font color="#007700">, </font><font color="#0000BB">11211</font><font color="#007700">);<br /><br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN117986" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><B CLASS="function" >Memcache::connect()</B ></TD ></TR ><TR ><TD ><B CLASS="function" >Memcache::pconnect()</B ></TD ></TR ><TR ><TD ><B CLASS="function" >Memcache::close()</B ></TD ></TR ><TR ><TD ><B CLASS="function" >Memcache::setServerParams()</B ></TD ></TR ><TR ><TD ><B CLASS="function" >Memcache::getServerStatus()</B ></TD ></TR ></TBODY ></TABLE ><P ></P > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.memcache-add.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.memcache-close.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Memcache::add</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.memcache.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Memcache::close</TD ></TR ></TABLE ></DIV ></BODY ></HTML >