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php如何获取文件大小和文件创建时间

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Jun 06, 2016 pm 08:06 PM

php

这篇文章主要介绍了php获得文件大小和文件创建时间的方法,涉及php中filesize及fileatime函数的使用技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了php获得文件大小和文件创建时间的方法。分享给大家供大家参考。具体分析如下：

php中可以显示文件的各种属性，这些属性包括文件的最后访问时间、最后修改时间、文件大小等。

<HTML>
<HEAD>
<TITLE>Returning information about a file</TITLE>
</HEAD>
<BODY>
<?php
print "The size of the file is ";
print filesize( "samplefile.doc" );
print "<br>";
$atime = fileatime( "samplefile.doc" );
print "This file accessed on ";
print date("l, M d, Y g:i a", $atime);
print "<br>";
$mtime = filemtime( "samplefile.doc" );
print "This file was modified on ";
print date("l, M d, Y g:i a", $mtime);
print "<br>";
$ctime = filectime( "samplefile.doc" );
print "This file was changed on ";
print date("l, M d, Y g:i a", $ctime);
?>
</BODY>
</HTML>

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filemtime ( string filename )

返回文件上次被修改的时间，出错时返回 FALSE。时间以 Unix 时间戳的方式返回，可用于 date()。

filectime ( string filename )

返回文件上次 inode 被修改的时间，如果出错则返回 FALSE。时间以 Unix 时间戳的方式返回。

fileatime ( string filename )

返回文件上次被访问的时间，如果出错则返回 FALSE。时间以 Unix 时间戳的方式返回。

////////////////////////////

filectime：linux最后一次修改时间
filemtime：最后一次修改时间
fileatime：最后一次访问的时间

/////////////////////////////////////////////////////////////////////////////

filemtime
(PHP 3, PHP 4 )

filemtime -- 取得文件修改时间
说明

int filemtime ( string filename)

返回文件上次被修改的时间，出错时返回 FALSE。时间以 Unix 时间戳的方式返回，可用于 date()。
注: 本函数的结果会被缓存。详细信息参见 clearstatcache()。
注: 本函数不能作用于远程文件，被检查的文件必须通过服务器的文件系统访问。
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。

例子 1. filemtime() 例子

<?php
// outputs e.g. somefile.txt was last modified: December 29 2002 22:16:23.
$filename = &#39;somefile.txt&#39;;
if (file_exists($filename)) {
  echo "$filename was last modified: " . date ("F d Y H:i:s.", filemtime($filename));
 
}
?>

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filectime
(PHP 3, PHP 4 )

filectime -- 取得文件的 inode 修改时间
说明

int filectime ( string filename)

返回文件上次 inode 被修改的时间，如果出错则返回 FALSE。时间以 Unix 时间戳的方式返回。
注意：在大多数 Unix 文件系统中，当一个文件的 inode 数据被改变时则该文件被认为是修改了。也就是说，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。参见 filemtime()（这才是你想用于在 web 页面中建立“最后更新时间”脚注的函数）和 fileatime()。
注意某些 Unix 说明文本中把 ctime 说成是该文件建立的时间，这是错的。在大多数 Unix 文件系统中没有 Unix 文件的建立时间。
注: 本函数的结果会被缓存。详细信息参见 clearstatcache()。
注: 本函数不能作用于远程文件，被检查的文件必须通过服务器的文件系统访问。

例子 1. fileatime() 例子

<?php
 
// 输出类似：somefile.txt was last changed: December 29 2002 22:16:23.
 
$filename = &#39;somefile.txt&#39;;
if (file_exists($filename)) {
  echo "$filename was last changed: " . date ("F d Y H:i:s.", filectime($filename));
}
?>

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fileatime
(PHP 3, PHP 4 )

fileatime -- 取得文件的上次访问时间
说明

int fileatime ( string filename)

返回文件上次被访问的时间，如果出错则返回 FALSE。时间以 Unix 时间戳的方式返回。
注意：一个文件的 atime 应该在不论何时读取了此文件中的数据块时被更改。当一个应用程序定期访问大量文件或目录时很影响性能。有些 Unix 文件系统可以在加载时关闭 atime 的更新以提高这类程序的性能。USENET 新闻组假脱机是一个常见的例子。在这种文件系统下本函数没有用处。
注: 本函数的结果会被缓存。详细信息参见 clearstatcache()。
注: 本函数不能作用于远程文件，被检查的文件必须通过服务器的文件系统访问。
例子 1. fileatime() 例子

<?php
// 输出类似：somefile.txt was last accessed: December 29 2002 22:16:23.
$filename = &#39;somefile.txt&#39;;
if (file_exists($filename)) {
  echo "$filename was last accessed: " . date ("F d Y H:i:s.", fileatime($filename));
}
?>

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