[SOLVED] Reverse order of directory listing produced by code..

[cgm225]

I am using the following code to list the subdirectories under a main directory.  However, I want to reverse the order that they are currently listing in.  Preferably, I would like them to list based on each sub-directory's last modification time, with the most recently modified directories at the top of the list.

 

Thank you all in advance!

 

<?php
if ($handle = opendir('/some_directory')) {
    while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
            echo "$file\n";
        }
    }
    closedir($handle);
}
?> 

[cooldude832]

Don't know if its possible off read, probably you would need to first gather all in some sort of multi D array and then sort by Modified date and then work off of that, the opendir only goes alphabetically I believe

[cooldude832]

try something like this

 

<?php
if ($handle = opendir('/some_directory')) {
$i = 0;    
while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
          $files[$file]['mdate'] = filemtime($filename);
          $files[$file]['name'] = $file; 
        }
    }
    closedir($handle);
array_multisort($files[]['mdate']);  //check this it might be wrong, but it should get you it all sorted by 'mdate' and then you can just reverse it if needed
}
?> 

[cgm225]

That is very helpful!  Thank you

 

However, I am having some trouble getting the array_multisort function to work.. could you help me with that?  I am getting a "Fatal error: Cannot use [] for reading in /root/testing.php on line 19" error.

[JP128]

<?php
if ($handle = opendir('/some_dir/')) {
    while (false !== ($file = readdir($handle))) {
      if ($file != "." && $file != "..") {
        $file1[] = $file;
      }
    }
    closedir($handle);
}

    foreach(array_reverse($file1) as $file){
      echo $file."<br>";
    }
?> 

[cooldude832]

JP the readdir does:

Returns the filename of the next file from the directory. The filenames are returned in the order in which they are stored by the filesystem.

 

it will not sort using that method

 

I'm trying a blank and i can't remember how to sort $files using the inner array values

try $sortted = arsort($files[]['mdate']);

 

 

[cgm225]

@cooldude832 - thank you for getting the ball rolling!

 

@JP128 - your example works perfectly for me!  Thank you so much!

 

 

[JP128]

Yes, I know that it sorts them how they were stored... but if he got them that way in the first place, and then wanted those to be reversed, it would work his way.

 

 

I read your sig... and saw

 

Expert in mutli-d array analysis and mathematical modeling of real world applications using partial differential equations and integral calculus.

 

lol, I am still a noob with arrays, and learning alot.. I know some stuff about multi D arrays, but thats with Java... but kinda the same thing

 

 

[cooldude832]

fyi that isn't rock solid because of the function readdir, but if you don't do anything stupid to the files it won't hurt you.  (like if you drag around files in the ftp or resort them in a method other than date the readdir will read based on a different sort)

[cooldude832]

i make my arrays too complicated for most questions here so i tend to try and water em down and then i can't use my methods on them. 

[JP128]

What do you think that the hardest part about making a multi-d array?

[cooldude832]

my hardest part is deciding on how high up i make my primary key (so to speak)  most of the time I like to make a primary key in my  3rd or high power level to it and I use a generic name then I use my first search parm, p-key, more search parm and then all the way down the data I need.  I made a search engine that does 5 level multi d sort of data for some SEO help and paganiation usages and of course to display the end result data.

 

arrays are really powerful, its just tricky to see them sometimes because of their abstract concept

[JP128]

that confused me lol

[cooldude832]

well your so called counting index doesn't need to be your first key it can be a buried key which i do a lot of times for an optimization of sorting.  I like to grab more data than what's needed in a mysql query and then sort it out in "post" via arrays and logic, if i could i run 1 mysql query on each page, but sometimes you need that second.  Rarely do i ever need more than 2 queries to get data from the tables.

[JP128]

Oh ok.