<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >xattr_set</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="xattr Functions" HREF="ref.xattr.html"><LINK REL="PREVIOUS" TITLE="xattr_remove" HREF="function.xattr-remove.html"><LINK REL="NEXT" TITLE="xattr_supported" HREF="function.xattr-supported.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.xattr-remove.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.xattr-supported.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.xattr-set" ></A >xattr_set</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN239568" ></A ><P > (PECL)</P >xattr_set -- Set an extended attribute </DIV ><DIV CLASS="refsect1" ><A NAME="AEN239571" ></A ><H2 >说明</H2 >bool <B CLASS="methodname" >xattr_set</B > ( string filename, string name, string value [, int flags] )<BR ></BR ><P > This function sets the value of an extended attribute of a file. </P ><P >扩展的属性有两个不同的名字空间:user 和 root 名字空间。user 名字空间对所有用户均有效,而 root 名字空间仅对拥有 root 权限的用户有效。xattr 默认在 user 名字空间上进行操作,但是可以使用 <CODE CLASS="parameter" >flags</CODE > 参数进行更改。</P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN239591" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >filename</CODE ></DT ><DD ><P > The file in which we set the attribute. </P ></DD ><DT ><CODE CLASS="parameter" >name</CODE ></DT ><DD ><P > The name of the extended attribute. This attribute will be created if it doesn't exist or replaced otherwise. You can change this behaviour by using the <CODE CLASS="parameter" >flags</CODE > parameter. </P ></DD ><DT ><CODE CLASS="parameter" >value</CODE ></DT ><DD ><P > The value of the attribute. </P ></DD ><DT ><CODE CLASS="parameter" >flags</CODE ></DT ><DD ><P > <DIV CLASS="table" ><A NAME="AEN239616" ></A ><P ><B >表 1. Supported xattr flags</B ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><COL><COL><TBODY ><TR ><TD ><TT CLASS="constant" ><B >XATTR_CREATE</B ></TT ></TD ><TD >Function will fail if extended attribute already exists.</TD ></TR ><TR ><TD ><TT CLASS="constant" ><B >XATTR_REPLACE</B ></TT ></TD ><TD >Function will fail if extended attribute doesn't exist.</TD ></TR ><TR ><TD ><TT CLASS="constant" ><B >XATTR_DONTFOLLOW</B ></TT ></TD ><TD >Do not follow the symbolic link but operate on symbolic link itself.</TD ></TR ><TR ><TD ><TT CLASS="constant" ><B >XATTR_ROOT</B ></TT ></TD ><TD >Set attribute in root (trusted) namespace. Requires root privileges.</TD ></TR ></TBODY ></TABLE ></DIV > </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN239636" ></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="AEN239641" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN239644" ></A ><P ><B >例 1. Sets extended attributes on .wav file</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$file </font><font color="#007700">= </font><font color="#DD0000">'my_favourite_song.wav'</font><font color="#007700">;<br /></font><font color="#0000BB">xattr_set</font><font color="#007700">(</font><font color="#0000BB">$file</font><font color="#007700">, </font><font color="#DD0000">'Artist'</font><font color="#007700">, </font><font color="#DD0000">'Someone'</font><font color="#007700">);<br /></font><font color="#0000BB">xattr_set</font><font color="#007700">(</font><font color="#0000BB">$file</font><font color="#007700">, </font><font color="#DD0000">'My ranking'</font><font color="#007700">, </font><font color="#DD0000">'Good'</font><font color="#007700">);<br /></font><font color="#0000BB">xattr_set</font><font color="#007700">(</font><font color="#0000BB">$file</font><font color="#007700">, </font><font color="#DD0000">'Listen count'</font><font color="#007700">, </font><font color="#DD0000">'34'</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* ... other code ... */<br /><br /></font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"You've played this song %d times"</font><font color="#007700">, </font><font color="#0000BB">xattr_get</font><font color="#007700">(</font><font color="#0000BB">$file</font><font color="#007700">, </font><font color="#DD0000">'Listen count'</font><font color="#007700">)); <br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN239647" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.xattr-get.html" ><B CLASS="function" >xattr_get()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.xattr-remove.html" ><B CLASS="function" >xattr_remove()</B ></A ></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.xattr-remove.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.xattr-supported.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >xattr_remove</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.xattr.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >xattr_supported</TD ></TR ></TABLE ></DIV ></BODY ></HTML >