在PHP中按日期排序文件

I currently have an index.php file which allows me to output the list of files inside the same directory, the output shows the names then I used filemtime() function to show the date when the file was modified. my problem now is, how will I sort the output to show the latest modified file ?, I've been thinking for awhile how to do this. if only I am doing it with mysql interaction there will be no problem at all. please show me an example how to sort and output the list of files starting from the latest modified one. this is what i have for now

我目前有一个index.php文件，它允许我输出同一目录中的文件列表，输出显示名称然后我使用filemtime（）函数来显示文件被修改的日期。我现在的问题是，如何对输出进行排序以显示最新修改的文件？我一直在考虑如何做到这一点。如果我只是用mysql交互来做这件事就没问题了。请给我一个例子，说明如何从最新修改的文件开始排序和输出文件列表。这就是我现在所拥有的

if ($handle = opendir('.')) {
while (false !== ($file = readdir($handle))) {
       if ($file != "." && $file != "..") {
        $lastModified = date('F d Y, H:i:s',filemtime($file));
          if(strlen($file)-strpos($file,".swf")== 4){
            echo "<tr><td><input type=\"checkbox\" name=\"box[]\"></td><td><a href=\"$file\" target=\"_blank\">$file</a></td><td>$lastModified</td></tr>";
           }
       }
   }
   closedir($handle);
}

5 个解决方案

#1

You need to put the files into an array in order to sort and find the last modified file.

您需要将文件放入数组中，以便对最后修改的文件进行排序和查找。

$files = array();
if ($handle = opendir('.')) {
    while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
           $files[filemtime($file)] = $file;
        }
    }
    closedir($handle);

    // sort
    ksort($files);
    // find the last modification
    $reallyLastModified = end($files);

    foreach($files as $file) {
        $lastModified = date('F d Y, H:i:s',filemtime($file));
        if(strlen($file)-strpos($file,".swf")== 4){
           if ($file == $reallyLastModified) {
             // do stuff for the real last modified file
           }
           echo "<tr><td><input type=\"checkbox\" name=\"box[]\"></td><td><a href=\"$file\" target=\"_blank\">$file</a></td><td>$lastModified</td></tr>";
        }
    }
}

Not tested, but that's how to do it.

没有经过测试，但这是怎么做的。

#2

142

This would get all files in path/to/files with an .swf extension into an array and then sort that array by the file's mtime

这会将带有.swf扩展名的path / to / files中的所有文件放入一个数组中，然后按文件的mtime对该数组进行排序

$files = glob('path/to/files/*.swf');
usort($files, function($a, $b) {
    return filemtime($a) < filemtime($b);
});

The above uses an Lambda function and requires PHP 5.3. Prior to 5.3, you would do

以上使用Lambda函数，需要PHP 5.3。在5.3之前，你会这样做

usort($files, create_function('$a,$b', 'return filemtime($a)<filemtime($b);'));

If you don't want to use an anonymous function, you can just as well define the callback as a regular function and pass the function name to usort instead.

如果您不想使用匿名函数，您也可以将回调定义为常规函数，并将函数名称传递给usort。

With the resulting array, you would then iterate over the files like this:

使用生成的数组，然后迭代文件，如下所示：

foreach($files as $file){
    printf('<tr><td><input type="checkbox" name="box[]"></td>
            <td><a href="%1$s" target="_blank">%1$s</a></td>
            <td>%2$s</td></tr>', 
            $file, // or basename($file) for just the filename w\out path
            date('F d Y, H:i:s', filemtime($file)));
}

Note that because you already called filemtime when sorting the files, there is no additional cost when calling it again in the foreach loop due to the stat cache.

请注意，因为您在排序文件时已经调用了filemtime，所以由于stat缓存而在foreach循环中再次调用它时没有额外的成本。

#3

An example that uses RecursiveDirectoryIterator class, it's a convenient way to iterate recursively over filesystem.

使用RecursiveDirectoryIterator类的示例，它是一种在文件系统上递归迭代的便捷方式。

$output = array();
foreach( new RecursiveIteratorIterator( 
    new RecursiveDirectoryIterator( 'path', FilesystemIterator::SKIP_DOTS | FilesystemIterator::UNIX_PATHS ) ) as $value ) {      
        if ( $value->isFile() ) {
            $output[] = array( $value->getMTime(), $value->getRealPath() );
        }
}

usort ( $output, function( $a, $b ) {
    return $a[0] > $b[0];
});

#4

I use your exact proposed code with only some few additional lines. The idea is more or less the same of the one proposed by @elias, but in this solution there cannot be conflicts on the keys since each file in the directory has a different filename and so adding it to the key solves the conflicts. The first part of the key is the datetime string formatted in a manner such that I can lexicographically compare two of them.

我使用你的确切建议代码只有几个额外的行。这个想法或多或少与@elias提出的想法相同，但在此解决方案中，密钥上不会有冲突，因为目录中的每个文件都有不同的文件名，因此将其添加到密钥可以解决冲突。密钥的第一部分是日期时间字符串格式化，以便我可以按字母顺序比较其中两个。

if ($handle = opendir('.')) {
    $result = array();
    while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
            $lastModified = date('F d Y, H:i:s',filemtime($file));
            if(strlen($file)-strpos($file,".swf")== 4){
                $result [date('Y-m-d H:i:s',filemtime($file)).$file] =
                    "<tr><td><input type=\"checkbox\" name=\"box[]\"></td><td><a href=\"$file\" target=\"_blank\">$file</a></td><td>$lastModified</td></tr>";
            }
        }
    }
    closedir($handle);
    krsort($result);
    echo implode('', $result);
}

#5

-1

$files = array_diff(scandir($dir,SCANDIR_SORT_DESCENDING), array('..', '.')); print_r($files);

$ files = array_diff（scandir（$ dir，SCANDIR_SORT_DESCENDING），array（'..'，'。'））;的print_r（$文件）;

#1