排序子目录列表

Question

I have two questions:

1) I'm use the below code to output a list of sub-directories contained in the folder 'issues'. Each sub-directory is a number. I'd like to sort that output by increasing value, so 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, ... 20, 21 etc.

How can I do this?

<?php

chdir('issues');
$d = dir(".");

echo "<ul>";

while (false !== ($entry = $d->read()))
{
 if (is_dir($entry) && ($entry != '.') && ($entry != 'sponsors') && 
 ($entry != '..'))
 echo "<li><a href='{$entry}'>{$entry}</a></li>";
}

echo "</ul>";

$d->close();

?>

2) On a different part of the same page, I also want to output a link to the latest issue, ie the sub-directory with the highest number. How would I do that?

Thank you!

Answer 1

Use scandir() with array_slice to get a sorted array of the directory contents.

Use asort for accurate numerical sorting as dossy suggested.

$directory = 'issues';
$contents = array_slice(scandir('issues'), 2);
$sub_dirs = array();
foreach($contents as $c){
   $path = $directory."/".$c;
   if(is_dir($path) && $c !== 'sponsors'){
      $sub_dirs[] = $c;
   }
}
asort($sub_dirs, SORT_NUMERIC);
$latest = end($sub_dirs);
reset($sub_dirs);
echo '<ul>';
foreach($sub_dirs as $sub){
   echo '<li><a href="'.$directory.'/'.$sub.'">'.$sub.'</a></li>';
}
echo '</ul>';
echo '<a href="'.$directory.'/'.$latest.'">'.$latest.'</a>';