基于目录名称的PHP最旧路径

Question

I have on my linux machine such folder tree structure:
/dir/yyyy/mm/dd/HH

eg:
/dir/2014/03/01/08
/dir/2014/03/20/09
/dir/2014/03/01/10
/dir/2014/08/01/10
/dir/2014/12/15/10
/dir/2015/01/01/14

I'd like to get in php what path is the oldest, like this:
The oldest path is: 2014-03-01 08
The newest path is: 2015-01-01 14

How it can be done?

Answer 1

It could be written better but it works

 $paths = array(
                 '/dir/2014/03/01/08',
                 '/dir/2014/03/20/09',
                 '/dir/2014/03/01/10',
                 '/dir/2014/08/01/10',
                 '/dir/2014/12/15/10',
                 '/dir/2015/01/01/14',
 );

 $dates = array();

 foreach($paths as $path)
 {
     $matches = array();
     preg_match('#([^\/]+?)\/([^\/]+?)\/([^\/]+?)\/([^\/]+?)\/([^\/]+)#', $path, $matches);
     $dates[$path] = strtotime(sprintf("%s-%s-%s %s:00:00", $matches[2],      $matches[3], $matches[4], $matches[5]));
 }

 asort($dates);

 $dates = array_keys($dates);
 $oldest = array_shift($dates);
 $newest = array_pop($dates);

It changes date find by regex to unixtimestamp then sorts it and returns top and bottom value of sorted array.

Answer 2

Little bit like Pascal style)

<?php

$oldest = '';
$newest = '';
$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator('./dir/'));
foreach ($iterator as $file => $object) {
    if ($iterator->getDepth() === 4) {
        $name = $object->getPath();
        if ($name > $newest) {
            $newest = $name;
        }
        if (empty($oldest) or $name < $oldest) {
            $oldest = $name;
        }
    }
}
var_export([$oldest, $newest]);

Result:

array (
    0 => './dir/2014/03/01/08',
    1 => './dir/2015/01/01/14',
)

Answer 3

All you have to do is loop through each folder and find the directory that has the lowest number. If you have the file paths stored in a database, it can be easier, but from your question it seems like you want to search the folders.

<?php

    $base = 'dir';
    $yearLowest = lowestDir($base);
    $monthLowest = lowestDir($yearLowest);
    $dayLowest = lowestDir($monthLowest);

    echo $dayLowest;

    function lowestDir($dir) {
        $lowest = null;
        $handle = opendir($dir);

        while(($name = readdir($handle))) {
            if($name == '.' || $name == '..') {
                continue;
            }

            if(is_dir($dir.'/'.$name) && ($lowest == null || $name < $lowest)) {
                $lowest = $name;
            }
        }

        closedir($handle);
        return $dir.'/'.$lowest;
    }

?>