php 获取目录中最后修改的文件
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Get last modified file in a directory
提问by dynamic
Is there a way to select only the last file in a directory (with the extensions jpg|png|gif?)
有没有办法只选择目录中的最后一个文件（带有扩展名jpg|png|gif？）
Or do I have to parse the entire directory and check using filemtime?
或者我必须解析整个目录并检查使用filemtime？
回答by mario
Yes you have to read through them all. But since directory accesses are cached, you shouldn't really worry about it.
是的，你必须通读它们。但是由于目录访问被缓存，所以您不必担心。
$files = array_merge(glob("img/*.png"), glob("img/*.jpg"));
$files = array_combine($files, array_map("filemtime", $files));
arsort($files);
$latest_file = key($files);
回答by Pascal MARTIN
I don't remember having ever seen a function that would do what you ask.
我不记得曾经见过可以执行您要求的功能。
So, I think you will have to go through all (at least jpg/png/gif)files, and search for the last modification date of each of them.
因此，我认为您必须浏览所有（至少是 jpg/png/gif）文件，并搜索每个文件的最后修改日期。
Here's a possible solution, based on the DirectoryIteratorclass of the SPL :
这是一个可能的解决方案，基于DirectoryIteratorSPL的类：
$path = null;
$timestamp = null;
$dirname = dirname(__FILE__);
$dir = new DirectoryIterator($dirname);
foreach ($dir as $fileinfo) {
if (!$fileinfo->isDot()) {
if ($fileinfo->getMTime() > $timestamp) {
// current file has been modified more recently
// than any other file we've checked until now
$path = $fileinfo->getFilename();
$timestamp = $fileinfo->getMTime();
}
}
}
var_dump($path);
Of course, you could also do the same thing with readdir()and other corresponding functions.
当然，你也可以用readdir()和 其他相应的函数来做同样的事情。
回答by Waqar Alamgir
function listdirfile_by_date($path)
{
$dir = opendir($path);
$list = array();
while($file = readdir($dir))
{
if($file != '..' && $file != '.')
{
$mtime = filemtime($path . $file) . ',' . $file;
$list[$mtime] = $file;
}
}
closedir($dir);
krsort($list);
foreach($list as $key => $value)
{
return $list[$key];
}
return '';
}
回答by Shamsher Sidhu
Use this code:
使用此代码：
<?php
// outputs e.g. somefile.txt was last modified: December 29 2002 22:16:23.
$filename = 'somefile.txt';
if (file_exists($filename)) {
echo "$filename was last modified: " . date ("F d Y H:i:s.", filemtime($filename));
}
?>
