简单介绍PHP获取文件属性方法_PHP教程-php教程-PHP中文网

简单介绍PHP获取文件属性方法_PHP教程

php中文网

发布： 2016-07-15 13:34:31

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PHP获取文件属性之获取最近修改时间:

<ol class="dp-xml"><li class="alt"><span><span class="tag"><</span><span> ?php  </span></span></li><li><span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">'test.txt'</span><span>;  </span></li><li class="alt"><span>echo date('r', <br />filemtime($file));  </span></li><li><span class="tag">?></span><span> </span></li></ol>

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返回的说unix的时间戳,这在缓存技术常用.

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相关PHP获取文件属性的还有获取上次被访问的时间fileatime(),filectime()当文件的权限，所有者，所有组或其它 inode 中的元数据被更新时间,fileowner()函数返回文件所有者

$owner = posix_getpwuid(fileowner($file));

(非window系统),ileperms()获取文件的权限,

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<ol class="dp-xml"><li class="alt"><span><span class="tag"><</span><span> ?php  </span></span></li><li><span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">'dirlist.php'</span><span>;  </span></li><li class="alt"><span>$</span><span class="attribute">perms</span><span> = </span><span class="attribute-value">substr</span><span>(sprintf<br />('%o', fileperms($file))<br />, -4);  </span></li><li><span>echo $perms;  </span></li><li class="alt"><span class="tag">?></span><span> </span></li><li><span> </span></li></ol>

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filesize()返回文件大小的字节数:

<ol class="dp-xml"><li class="alt"><span><span class="tag"><</span><span> ?php  </span></span></li><li><span>// 输出类似：somefile.txt:<br /> 1024 bytes  </span></li><li class="alt"><span>$</span><span class="attribute">filename</span><span> = </span><span class="attribute-value">'somefile.txt'</span><span>;  </span></li><li><span>echo $filename . ': ' <br />. filesize($filename) . ' bytes';  </span></li><li class="alt"><span class="tag">?></span><span> </span></li><li><span> </span></li></ol>

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PHP获取文件属性的全部信息有个返回数组的函数stat()函数:

<ol class="dp-xml"><li class="alt"><span><span class="tag"><</span><span> ?php  </span></span></li><li><span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">'dirlist.php'</span><span>;  </span></li><li class="alt"><span>$</span><span class="attribute">perms</span><span> = </span><span class="attribute-value">stat</span><span>($file);  </span></li><li><span>var_dump($perms);  </span></li><li class="alt"><span class="tag">?></span><span> </span></li><li><span> </span></li></ol>

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