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><H1
CLASS="title"
>CLXXVII. xattr Functions</H1
><DIV
CLASS="PARTINTRO"
><A
NAME="AEN239314"
></A
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="xattr.intro"
>简介</A
></H1
><P
>&#13;     The xattr extension allows for the manipulation of extended attributes on a filesystem.
    </P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="xattr.requirements"
>需求</A
></H1
><P
>&#13;     To use xattr, you will need libattr installed. It is available
     at <A
HREF="http://oss.sgi.com/projects/xfs/"
TARGET="_top"
>http://oss.sgi.com/projects/xfs/</A
>.
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
      These functions only work on filesystems that support extended 
      attributes, and have them enabled at mount time. Some common
      filesystems that support extended attributes are ext2, ext3,
      reiserfs, jfs, and xfs.
     </P
></BLOCKQUOTE
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><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="xattr.installation"
>安装</A
></H1
><P
>&#13;  xattr is currently available through PECL
  <A
HREF="http://pecl.php.net/package/xattr"
TARGET="_top"
>http://pecl.php.net/package/xattr</A
>.
 </P
><P
>&#13;  If <A
HREF="http://pear.php.net/"
TARGET="_top"
>PEAR</A
> is available on your *nix-like
  system you can use the pear installer to install the xattr extension, by the
  following command: <B
CLASS="command"
>pear -v install xattr</B
>.
 </P
><P
>&#13;  You can always download the tar.gz package and install xattr by hand:
  <TABLE
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><P
><B
>例 1. xattr install by hand</B
></P
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><PRE
CLASS="shell"
>gunzip xattr-xxx.tgz
tar -xvf xattr-xxx.tar
cd xattr-xxx
phpize
./configure &#38;&#38; make &#38;&#38; make install</PRE
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>
 </P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="xattr.constants"
>预定义常量</A
></H1
><P
>以下常量由本扩展模块定义，因此只有在本扩展模块被编译到
PHP 中，或者在运行时被动态加载后才有效。</P
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="constant"
><B
>XATTR_ROOT</B
></TT
> 
    (<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>&#13;     Set attribute in root (trusted) namespace. Requires root privileges.
    </P
></DD
><DT
><TT
CLASS="constant"
><B
>XATTR_DONTFOLLOW</B
></TT
> 
    (<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>&#13;     Do not follow the symbolic link but operate on symbolic link itself.
    </P
></DD
><DT
><TT
CLASS="constant"
><B
>XATTR_CREATE</B
></TT
> 
    (<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>&#13;     Function will fail if extended attribute already exists.
    </P
></DD
><DT
><TT
CLASS="constant"
><B
>XATTR_REPLACE</B
></TT
> 
    (<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>&#13;     Function will fail if extended attribute doesn't exist.
    </P
></DD
></DL
></DIV
></DIV
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>目录</B
></DT
><DT
><A
HREF="function.xattr-get.html"
>xattr_get</A
>&nbsp;--&nbsp;
   Get an extended attribute
  </DT
><DT
><A
HREF="function.xattr-list.html"
>xattr_list</A
>&nbsp;--&nbsp;
   Get a list of extended attributes
  </DT
><DT
><A
HREF="function.xattr-remove.html"
>xattr_remove</A
>&nbsp;--&nbsp;
   Remove an extended attribute
  </DT
><DT
><A
HREF="function.xattr-set.html"
>xattr_set</A
>&nbsp;--&nbsp;
   Set an extended attribute
  </DT
><DT
><A
HREF="function.xattr-supported.html"
>xattr_supported</A
>&nbsp;--&nbsp;
   Check if filesystem supports extended attributes
  </DT
></DL
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