<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Shared Memory Functions</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="函数参考" HREF="funcref.html"><LINK REL="PREVIOUS" TITLE="session_write_close" HREF="function.session-write-close.html"><LINK REL="NEXT" TITLE="shmop_close" HREF="function.shmop-close.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="reference" 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.session-write-close.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.shmop-close.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="reference" ><A NAME="ref.shmop" ></A ><DIV CLASS="TITLEPAGE" ><H1 CLASS="title" >CL. Shared Memory Functions</H1 ><DIV CLASS="PARTINTRO" ><A NAME="AEN208884" ></A ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="shmop.intro" >简介</A ></H1 ><P > Shmop is an easy to use set of functions that allows PHP to read, write, create and delete Unix shared memory segments. </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B > Versions of Windows previous to Windows 2000 do not support shared memory. Under Windows, Shmop will only work when PHP is running as a web server module, such as Apache or IIS (CLI and CGI will not work). </P ></BLOCKQUOTE ></DIV ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B > In PHP 4.0.3, these functions were prefixed by <TT CLASS="literal" >shm</TT > rather than <TT CLASS="literal" >shmop</TT >. </P ></BLOCKQUOTE ></DIV ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="shmop.requirements" >需求</A ></H1 ><P >要编译本扩展模块无需外部库文件。</P ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="shmop.installation" >安装</A ></H1 ><P > To use shmop you will need to compile PHP with the <CODE CLASS="option" >--enable-shmop</CODE > parameter in your configure line. </P ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="shmop.configuration" >运行时配置</A ></H1 ><P >本扩展模块在 <TT CLASS="filename" >php.ini</TT > 中未定义任何配置选项。</P ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="shmop.resources" >资源类型</A ></H1 ><P > </P ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="shmop.constants" >预定义常量</A ></H1 ><P >本扩展模块未定义任何常量。</P ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="shmop.examples" >范例</A ></H1 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN208914" ></A ><P ><B >例 1. Shared Memory Operations Overview</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">// Create 100 byte shared memory block with system id of 0xff3<br /></font><font color="#0000BB">$shm_id </font><font color="#007700">= </font><font color="#0000BB">shmop_open</font><font color="#007700">(</font><font color="#0000BB">0xff3</font><font color="#007700">, </font><font color="#DD0000">"c"</font><font color="#007700">, </font><font color="#0000BB">0644</font><font color="#007700">, </font><font color="#0000BB">100</font><font color="#007700">);<br />if (!</font><font color="#0000BB">$shm_id</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">"Couldn't create shared memory segment\n"</font><font color="#007700">;<br />}<br /><br /></font><font color="#FF8000">// Get shared memory block's size<br /></font><font color="#0000BB">$shm_size </font><font color="#007700">= </font><font color="#0000BB">shmop_size</font><font color="#007700">(</font><font color="#0000BB">$shm_id</font><font color="#007700">);<br />echo </font><font color="#DD0000">"SHM Block Size: " </font><font color="#007700">. </font><font color="#0000BB">$shm_size </font><font color="#007700">. </font><font color="#DD0000">" has been created.\n"</font><font color="#007700">;<br /><br /></font><font color="#FF8000">// Lets write a test string into shared memory<br /></font><font color="#0000BB">$shm_bytes_written </font><font color="#007700">= </font><font color="#0000BB">shmop_write</font><font color="#007700">(</font><font color="#0000BB">$shm_id</font><font color="#007700">, </font><font color="#DD0000">"my shared memory block"</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">);<br />if (</font><font color="#0000BB">$shm_bytes_written </font><font color="#007700">!= </font><font color="#0000BB">strlen</font><font color="#007700">(</font><font color="#DD0000">"my shared memory block"</font><font color="#007700">)) {<br /> echo </font><font color="#DD0000">"Couldn't write the entire length of data\n"</font><font color="#007700">;<br />}<br /><br /></font><font color="#FF8000">// Now lets read the string back<br /></font><font color="#0000BB">$my_string </font><font color="#007700">= </font><font color="#0000BB">shmop_read</font><font color="#007700">(</font><font color="#0000BB">$shm_id</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">$shm_size</font><font color="#007700">);<br />if (!</font><font color="#0000BB">$my_string</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">"Couldn't read from shared memory block\n"</font><font color="#007700">;<br />}<br />echo </font><font color="#DD0000">"The data inside shared memory was: " </font><font color="#007700">. </font><font color="#0000BB">$my_string </font><font color="#007700">. </font><font color="#DD0000">"\n"</font><font color="#007700">;<br /><br /></font><font color="#FF8000">//Now lets delete the block and close the shared memory segment<br /></font><font color="#007700">if (!</font><font color="#0000BB">shmop_delete</font><font color="#007700">(</font><font color="#0000BB">$shm_id</font><font color="#007700">)) {<br /> echo </font><font color="#DD0000">"Couldn't mark shared memory block for deletion."</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">shmop_close</font><font color="#007700">(</font><font color="#0000BB">$shm_id</font><font color="#007700">);<br /> <br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ></DIV ><DIV CLASS="TOC" ><DL ><DT ><B >目录</B ></DT ><DT ><A HREF="function.shmop-close.html" >shmop_close</A > -- Close shared memory block</DT ><DT ><A HREF="function.shmop-delete.html" >shmop_delete</A > -- Delete shared memory block</DT ><DT ><A HREF="function.shmop-open.html" >shmop_open</A > -- Create or open shared memory block</DT ><DT ><A HREF="function.shmop-read.html" >shmop_read</A > -- Read data from shared memory block</DT ><DT ><A HREF="function.shmop-size.html" >shmop_size</A > -- Get size of shared memory block</DT ><DT ><A HREF="function.shmop-write.html" >shmop_write</A > -- Write data into shared memory block</DT ></DL ></DIV ></DIV ></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.session-write-close.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.shmop-close.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >session_write_close</TD 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