📄 function.touch.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Sets access and modification time of file</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.tmpfile.html">tmpfile</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.umask.html">umask</a></div> <div class="up"><a href="ref.filesystem.html">Filesystem Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.touch" class="refentry"> <div class="refnamediv"> <h1 class="refname">touch</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">touch</span> — <span class="dc-title">Sets access and modification time of file</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>touch</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$filename</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$time</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$atime</tt></span> ]] )</div> <p class="para rdfs-comment"> Attempts to set the access and modification times of the file named in the <i><tt class="parameter">filename</tt></i> parameter to the value given in <i><tt class="parameter">time</tt></i>. Note that the access time is always modified, regardless of the number of parameters. </p> <p class="para"> If the file does not exist, it will be created. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">filename</tt></i></span> <dd> <p class="para"> The name of the file being touched. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">time</tt></i></span> <dd> <p class="para"> The touch time. If <i><tt class="parameter">time</tt></i> is not supplied, the current system time is used. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">atime</tt></i></span> <dd> <p class="para"> If present, the access time of the given filename is set to the value of <i><tt class="parameter">atime</tt></i> </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <b><tt>TRUE</tt></b> on success or <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">5.3.0</td> <td colspan="1" rowspan="1" align="left"> It became possible to change the modification time of a directory under Windows. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>touch()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">touch</span><span style="color: #007700">(</span><span style="color: #0000BB">$FileName</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"$FileName modification time has been changed to present time"</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"Sorry, could not change modification time of $FileName"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> <div class="example"> <p><b>Example #2 <b>touch()</b> using the <i><tt class="parameter">time</tt></i> parameter</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">/* <br /> * This is the touch time, we'll set it to one hour <br /> * in the past.<br /> */<br /></span><span style="color: #0000BB">$time </span><span style="color: #007700">= </span><span style="color: #0000BB">time</span><span style="color: #007700">() - </span><span style="color: #0000BB">3600</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* Touch the file */<br /></span><span style="color: #007700">if(!</span><span style="color: #0000BB">touch</span><span style="color: #007700">(</span><span style="color: #DD0000">'some_file.txt'</span><span style="color: #007700">, </span><span style="color: #0000BB">$time</span><span style="color: #007700">))<br />{<br /> echo </span><span style="color: #DD0000">'Whoops, something went wrong...'</span><span style="color: #007700">;<br />}<br />else<br />{<br /> echo </span><span style="color: #DD0000">'Touched file with success'</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: Note that time resolution may differ from one file system to another.<br /></p></blockquote> <div class="warning"><b class="warning">Warning</b> <p class="para"> Prior to PHP 5.3.0 it was not possible to change the modification time of a directory with this function under Windows. </p> </div> </div> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.tmpfile.html">tmpfile</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.umask.html">umask</a></div> <div class="up"><a href="ref.filesystem.html">Filesystem Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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