<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >touch</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="Filesystem 文件系统函数" HREF="ref.filesystem.html"><LINK REL="PREVIOUS" TITLE="tmpfile" HREF="function.tmpfile.html"><LINK REL="NEXT" TITLE="umask" HREF="function.umask.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.tmpfile.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.umask.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.touch" ></A >touch</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN54982" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >touch -- 设定文件的访问和修改时间</DIV ><DIV CLASS="refsect1" ><A NAME="AEN54985" ></A ><H2 >说明</H2 >bool <B CLASS="methodname" >touch</B > ( string filename [, int time [, int atime]] )<BR ></BR ><P > 尝试将由 <CODE CLASS="parameter" >filename</CODE > 给出的文件的访问和修改时间设定为给出的时间。如果没有给出可选参数 <CODE CLASS="parameter" >time</CODE >,则使用当前系统时间。如果给出了第三个参数 <CODE CLASS="parameter" >atime</CODE >,则给定文件的访问时间会被设为 <CODE CLASS="parameter" >atime</CODE >。注意访问时间总是会被修改的,不论有几个参数。 </P ><P > 如果文件不存在,则会被创建。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 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN55008" ></A ><P ><B >例 1. <B CLASS="function" >touch()</B > 例子</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#007700">if (</font><font color="#0000BB">touch</font><font color="#007700">(</font><font color="#0000BB">$FileName</font><font color="#007700">)) {<br /> echo </font><font color="#DD0000">"$FileName modification time has been changed to present time"</font><font color="#007700">;<br />} else {<br /> echo </font><font color="#DD0000">"Sorry, could not change modification time of $FileName"</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </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.tmpfile.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.umask.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >tmpfile</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.filesystem.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >umask</TD ></TR ></TABLE ></DIV ></BODY ></HTML >