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  1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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  2. <html>
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  3.  <head>
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  4.   <meta http-equiv="content-type" content="text/html; charset=UTF-8">
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  5.   <title>取得文件修改时间</title>
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  6. 

  7.  </head>
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  8.  <body><div class="manualnavbar" style="text-align: center;">
    9. 

  9.  <div class="prev" style="text-align: left; float: left;"><a href="function.fileinode.html">fileinode</a></div>
    10. 

  10.  <div class="next" style="text-align: right; float: right;"><a href="function.fileowner.html">fileowner</a></div>
    11. 

  11.  <div class="up"><a href="ref.filesystem.html">Filesystem 函数</a></div>
    12. 

  12.  <div class="home"><a href="index.html">PHP Manual</a></div>
    13. 

  13. </div><hr /><div id="function.filemtime" class="refentry">
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  14.  <div class="refnamediv">
    15. 

  15.   <h1 class="refname">filemtime</h1>
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  16.   <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">filemtime</span> &mdash; <span class="dc-title">取得文件修改时间</span></p>
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  17. 

  18.  </div>
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  19.  <div class="refsect1 description" id="refsect1-function.filemtime-description">
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  20.   <h3 class="title">说明</h3>
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  21.   <div class="methodsynopsis dc-description">
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  22.    <span class="type">int</span> <span class="methodname"><strong>filemtime</strong></span>
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  23.     ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
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  24.    )</div>
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  25. 

  26.   <p class="para rdfs-comment">
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  27.    本函数返回文件中的数据块上次被写入的时间，也就是说，文件的内容上次被修改的时间。
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  28.   </p>
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  29.  </div>
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  30. 

  31. 

  32.  <div class="refsect1 parameters" id="refsect1-function.filemtime-parameters">
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  33.   <h3 class="title">参数</h3>
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  34.   <p class="para">
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  35.    <dl>
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  36. 

  37.     <dt>
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  38. 

  39.      <span class="term"><em><code class="parameter">filename</code></em></span>
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  40.      <dd>
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  41. 

  42.       <p class="para">
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  43.        文件的路径。
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  44.       </p>
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  45.      </dd>
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  46. 

  47.     </dt>
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  48. 

  49.    </dl>
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  50. 

  51.   </p>
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  52.  </div>
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  53. 

  54. 

  55.  <div class="refsect1 returnvalues" id="refsect1-function.filemtime-returnvalues">
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  56.   <h3 class="title">返回值</h3>
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  57.   <p class="para">
    58. 

  58.       返回文件上次被修改的时间， 或者在失败时返回 <strong><code>FALSE</code></strong>。时间以 Unix 时间戳的方式返回，可用于
    59. 

  59.     <span class="function"><a href="function.date.html" class="function">date()</a></span>。
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  60.   </p>
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  61.  </div>
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  62. 

  63. 

  64.  <div class="refsect1 examples" id="refsect1-function.filemtime-examples">
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  65.   <h3 class="title">范例</h3>
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  66.   <p class="para">
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  67.    <div class="example" id="example-2259">
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  68.     <p><strong>Example #1  <span class="function"><strong>filemtime()</strong></span>  例子</strong></p>
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  69.     <div class="example-contents">
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  70. <div class="phpcode"><code><span style="color: #000000">
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  71. <span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;outputs&nbsp;e.g.&nbsp;&nbsp;somefile.txt&nbsp;was&nbsp;last&nbsp;modified:&nbsp;December&nbsp;29&nbsp;2002&nbsp;22:16:23.<br /><br /></span><span style="color: #0000BB">$filename&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'somefile.txt'</span><span style="color: #007700">;<br />if&nbsp;(</span><span style="color: #0000BB">file_exists</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"</span><span style="color: #0000BB">$filename</span><span style="color: #DD0000">&nbsp;was&nbsp;last&nbsp;modified:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">date&nbsp;</span><span style="color: #007700">(</span><span style="color: #DD0000">"F&nbsp;d&nbsp;Y&nbsp;H:i:s."</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">filemtime</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">));<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
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  72. </span>
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  73. </code></div>
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  74.     </div>
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  75. 

  76.    </div>
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  77.   </p>
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  78.  </div>
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  79. 

  80. 

  81.  <div class="refsect1 errors" id="refsect1-function.filemtime-errors">
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  82.   <h3 class="title">错误／异常</h3>
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  83.   <p class="para">
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  84. 失败时抛出<strong><code>E_WARNING</code></strong>警告.
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  85. </p>
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  86.  </div>
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  87. 

  88. 

  89.  <div class="refsect1 notes" id="refsect1-function.filemtime-notes">
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  90.   <h3 class="title">注释</h3>
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  91.   <blockquote class="note"><p><strong class="note">Note</strong>: <p class="para">注意：不同文件系统对时间的判断方法可能是不相同的。</p></p></blockquote>
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  92.   <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数的结果会被缓存。参见
    93. 

  93.  <span class="function"><a href="function.clearstatcache.html" class="function">clearstatcache()</a></span> 以获得更多细节。</span></p></blockquote>
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  94.   <div class="tip"><strong class="tip">Tip</strong><p class="simpara">自 PHP 5.0.0 起, 此函数也用于<em class="emphasis">某些</em>
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  95. URL 包装器。请参见 <a href="wrappers.html" class="xref">支持的协议和封装协议</a>以获得支持  <span class="function"><a href="function.stat.html" class="function">stat()</a></span> 系列函数功能的包装器列表。</p></div>
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  96.  </div>
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  97. 

  98. 

  99.  <div class="refsect1 seealso" id="refsect1-function.filemtime-seealso">
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  100.   <h3 class="title">参见</h3>
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  101.   <p class="para">
    102. 

  102.    <ul class="simplelist">
    103. 

  103.     <li class="member"> <span class="function"><a href="function.filectime.html" class="function" rel="rdfs-seeAlso">filectime()</a> - 取得文件的 inode 修改时间</span></li>
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  104.     <li class="member"> <span class="function"><a href="function.stat.html" class="function" rel="rdfs-seeAlso">stat()</a> - 给出文件的信息</span></li>
    105. 

  105.     <li class="member"> <span class="function"><a href="function.touch.html" class="function" rel="rdfs-seeAlso">touch()</a> - 设定文件的访问和修改时间</span></li>
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  106.     <li class="member"> <span class="function"><a href="function.getlastmod.html" class="function" rel="rdfs-seeAlso">getlastmod()</a> - 获取页面最后修改的时间</span></li>
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  107.    </ul>
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  108.   </p>
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  109.  </div>
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  110. 

  111. </div><hr /><div class="manualnavbar" style="text-align: center;">
    112. 

  112.  <div class="prev" style="text-align: left; float: left;"><a href="function.fileinode.html">fileinode</a></div>
    113. 

  113.  <div class="next" style="text-align: right; float: right;"><a href="function.fileowner.html">fileowner</a></div>
    114. 

  114.  <div class="up"><a href="ref.filesystem.html">Filesystem 函数</a></div>
    115. 

  115.  <div class="home"><a href="index.html">PHP Manual</a></div>
    116. 

  116. </div></body></html>
    117. 

  117.