Sophie: php-manual-zh-5.2.4-1mdv2008.1 noarch

php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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><H1
><A
NAME="function.system"
></A
>system</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN189457"
></A
><P
>    (PHP 3, PHP 4, PHP 5)</P
>system&nbsp;--&nbsp;Execute an external program and display the output</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189460"
></A
><H2
>说明</H2
>string <B
CLASS="methodname"
>system</B
> ( string command [, int &#38;return_var] )<BR
></BR
><P
>&#13;   <B
CLASS="function"
>system()</B
> is just like the C version of the
   function in that it executes the given
   <CODE
CLASS="parameter"
>command</CODE
> and outputs the result.
  </P
><P
>&#13;   The <B
CLASS="function"
>system()</B
> call also tries to automatically
   flush the web server's output buffer after each line of output if
   PHP is running as a server module.
  </P
><P
>&#13;   If you need to execute a command and have all the data from the
   command passed directly back without any interference, use the
   <A
HREF="function.passthru.html"
><B
CLASS="function"
>passthru()</B
></A
> function.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189478"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>command</CODE
></DT
><DD
><P
>&#13;       The command that will be executed.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>return_var</CODE
></DT
><DD
><P
>&#13;       If the <CODE
CLASS="parameter"
>return_var</CODE
> argument is present, then the
       return status of the executed command will be written to this
       variable.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189493"
></A
><H2
>返回值</H2
><P
>&#13;   Returns the last line of the command output on success, and <TT
CLASS="constant"
><B
>FALSE</B
></TT
>
   on failure.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189497"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN189500"
></A
><P
><B
>例 1. <B
CLASS="function"
>system()</B
> example</B
></P
><TABLE
BORDER="0"
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CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#007700">echo </font><font color="#DD0000">'&lt;pre&gt;'</font><font color="#007700">;<br /><br /></font><font color="#FF8000">// Outputs all the result of shellcommand "ls", and returns<br />// the last output line into $last_line. Stores the return value<br />// of the shell command in $retval.<br /></font><font color="#0000BB">$last_line </font><font color="#007700">= </font><font color="#0000BB">system</font><font color="#007700">(</font><font color="#DD0000">'ls'</font><font color="#007700">, </font><font color="#0000BB">$retval</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// Printing additional info<br /></font><font color="#007700">echo </font><font color="#DD0000">'<br />&lt;/pre&gt;<br />&lt;hr /&gt;Last line of the output: ' </font><font color="#007700">. </font><font color="#0000BB">$last_line </font><font color="#007700">. </font><font color="#DD0000">'<br />&lt;hr /&gt;Return value: ' </font><font color="#007700">. </font><font color="#0000BB">$retval</font><font color="#007700">;<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189504"
></A
><H2
>注释</H2
><DIV
CLASS="warning"
><P
></P
><TABLE
CLASS="warning"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>警告</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>如果想允许用户输入的数据被传入本函数，则应使用
<A
HREF="function.escapeshellarg.html"
><B
CLASS="function"
>escapeshellarg()</B
></A
> 或 <A
HREF="function.escapeshellcmd.html"
><B
CLASS="function"
>escapeshellcmd()</B
></A
>
函数来确保用户不能欺骗系统从而执行任意命令。</P
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>如果用本函数启动一个程序并希望保持在后台运行，必须确保该程序的输出被重定向到一个文件或者其它输出流去，否则
PHP 会在程序执行结束前挂起。</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>在打开了<A
HREF="features.safe-mode.html"
>安全模式</A
>时，只能执行在
<A
HREF="features.safe-mode.html#ini.safe-mode-exec-dir"
>safe_mode_exec_dir</A
>
之内的程序。为实用起见目前不能在指向程序的路径中包含
<TT
CLASS="literal"
>..</TT
> 成分。</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="warning"
><P
></P
><TABLE
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><TR
><TD
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><B
>警告</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>在打开了<A
HREF="features.safe-mode.html"
>安全模式</A
>时，命令字符串会被 <A
HREF="function.escapeshellcmd.html"
><B
CLASS="function"
>escapeshellcmd()</B
></A
>
转义。从而 <TT
CLASS="literal"
>echo y | echo x</TT
> 就成了 <TT
CLASS="literal"
>echo "y | echo x"</TT
>。</P
></TD
></TR
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></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189523"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
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><TR
><TD
><A
HREF="function.exec.html"
><B
CLASS="function"
>exec()</B
></A
></TD
></TR
><TR
><TD
><A
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><B
CLASS="function"
>passthru()</B
></A
></TD
></TR
><TR
><TD
><A
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><B
CLASS="function"
>popen()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.escapeshellcmd.html"
><B
CLASS="function"
>escapeshellcmd()</B
></A
></TD
></TR
><TR
><TD
><A
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><B
CLASS="function"
>pcntl_exec()</B
></A
></TD
></TR
><TR
><TD
><A
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>backtick operator</A
></TD
></TR
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><P
></P
>
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