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PHP -- Sort array via modified time?

Posted on 2010-11-18
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Last Modified: 2012-05-10
I have this:


function getFiles($dir,$exclude=''){
      
   $handle = opendir($dir);
   for(;(false !== ($readdir = readdir($handle)));){
       if($readdir != '.' && $readdir != '..' && $readdir!=$exclude){
           $path = $dir.'/'.$readdir;          
           if(is_file($path) && !strstr($path,"___"))    {
                       $output[] = array('name'=>$readdir,'mtime'=>filemtime($path));
           }
       }
   }
   
   
   closedir($handle);  
   return isset($output)?$output:false;  
}

mtime is defined as modified time of the file using filemtime.. So if I do something like

$files = getFiles($pathTemp,'index.html');

It will give me an array of files, and I can call it via

      foreach ($files as $file) {
                      echo $file['name'];
                      echo $file['mtime'];
              }

But now that I have this array, how can I sort it properly? I want it to be OLDEST to NEWEST files, so that the oldest files are processed first.. Thanks!
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Question by:Valleriani
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6 Comments
 
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Expert Comment

by:Ray Paseur
ID: 34166115
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Expert Comment

by:Ray Paseur
ID: 34166153
Hmm.. You might want this, too.  Not sure about that.
http://us2.php.net/manual/en/function.uasort.php

Either function might meet your needs.  Example #2 on usort() looks particularly on point.
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Assisted Solution

by:Ray Paseur
Ray Paseur earned 250 total points
ID: 34166267

<?php // RAY_temp_valleriani.php
error_reporting(E_ALL);
echo "<pre>";

// REQUIRED AT PHP5.1+
date_default_timezone_set('America/Chicago');

// FROM THE POST AT EE
function getFiles($dir,$exclude='')
{
    $handle = opendir($dir);
    for(;(false !== ($readdir = readdir($handle)));)
    {
        if($readdir != '.' && $readdir != '..' && $readdir!=$exclude)
        {
            $path = $dir.'/'.$readdir;
            if(is_file($path) && !strstr($path,"___"))
            {
                $output[] = array('name'=>$readdir,'mtime'=>filemtime($path));
            }
        }
    }


    closedir($handle);
    return isset($output)?$output:false;
}

$my_files = getFiles(getcwd());

usort($my_files, 'mtimesort');
var_dump($my_files);


function mtimesort($a, $b)
{
    return strcmp((string)$a["mtime"], (string)$b["mtime"]);
}

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Accepted Solution

by:
gr8gonzo earned 250 total points
ID: 34166284
I've always relied on array_csort, which is just a nice wrapper around the built-in multisort. Here's how you use it:

Step 1: Throw this function into your code:
<?php
function array_csort() {        //coded by Ichier2003
    $args = func_get_args();
    $marray = array_shift($args);
    $msortline = 'return(array_multisort(';
    foreach ($args as $arg) {
        $i++;
        if (is_string($arg)) {
            foreach ($marray as $row) {
                $sortarr[$i][] = $row[$arg];
            }
        } else {
            $sortarr[$i] = $arg;
        }
        $msortline .= '$sortarr['.$i.'],';
    }
    $msortline .= '$marray));';
    eval($msortline);
    return $marray;
}
?>

Step 2: Call it like this to sort the array:
$files = array_csort($files,'mtime',SORT_ASC);

You can use SORT_DESC to go the other way. The nice thing about this function is that you can specify multiple columns for sorting (e.g. sort first by name in ascending order, then by modified date in descending order):

$files = array_csort($files,'name',SORT_ASC,'mtime',SORT_DESC);



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Expert Comment

by:Ray Paseur
ID: 34166427
JH: That is a nifty piece of code!  ~Ray
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Author Closing Comment

by:Valleriani
ID: 34166524
Thank you both! Both pieces of coding did the trick. Thanks!
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