How to sort files with more than one month in PHP?

Files on Disk to be sorted.

        'data/tsm/seasonal/tsm-2012-Apr-May-Jun.png', 
        'data/tsm/seasonal/tsm-2012-Jan-Feb-Mar.png', 
        'data/tsm/seasonal/tsm-2012-Jul-Aug-Sep.png', 
        'data/tsm/seasonal/tsm-2012-Oct-Nov-Dec.png', 
        'data/tsm/seasonal/tsm-2013-Apr-May-Jun.png', 
        'data/tsm/seasonal/tsm-2013-Jan-Feb-Mar.png'

I want to the files to be sorted first by year then by the first month eg. Apr for 'tsm-2012-Apr-May-Jun.tif', I want it to be sorted using 2012-Apr.

        <?php
function filesInRange($datadir, $parameter, $start_date, $end_date, $format, $patternval{
    $matches=array();
    $good_files = array();
       if (is_Dir($datadir)) {    
           foreach (new DirectoryIterator($datadir) as $fileInfo) {
               $matches=array(); 
               if ( !$fileInfo->isDot() && $fileInfo->isFile() ) {
               //  create a date by parsing the file name
                   preg_match($patternval, $fileInfo->getFileName(), $matches);
                   if ($matches) { 
                        $filedate = DateTime::createFromFormat($format, $matches[0]);
                   }//  determine if it's between start and end date
                   if ($filedate >= $start_date && $filedate <= $end_date) {
                     $good_files[] = $datadir.$fileInfo->getFileName();
                   }
               }

            }
        }
        asort($good_files);
        return $good_files;  
}
function startend($timeper1, $timeper2, $formatse) {
    global $start; 
    global $end; 
    $start = DateTime::createFromFormat( $formatse,$timeper1);
    $end   = DateTime::createFromFormat( $formatse,$timeper2);
}

To call the functions I do this.

$season = substr('2012-Jan-Feb-Mar', 0, -8); 
$season2 = substr('2013-Apr-May-Jun', 0, -8); 
startend($season, $season2, 'Y-M');
$allfiles = filesInRange( "data/tsm/seasonal/" , 'tsm', $start, $end, 'Y-M', '/(?<year>\d{4})-(?<month>\w{3})/' );

Then I get the directories echoed using foreach.

foreach ($allfiles as $filesfound) {
    echo '<a href="'. $filesfound.'">'. basename($filesfound). '</a>';
}
?>

Unfortunately the come unsorted.

sean9999 shared me this http://3v4l.org/WSaS3 page but it didn't help but it gives idea.

I guess, I have to use substr() to trim the other months but it is an array. Thank you for the help!

Solution

Alternatively, since you already got the values but unsorted, you could just use a custom sorting using usort(). You need to convert those months into month numbers first.

Rough example:

$allfiles = ['data/tsm/seasonal/tsm-2012-Apr-May-Jun.png', 'data/tsm/seasonal/tsm-2012-Jan-Feb-Mar.png', 'data/tsm/seasonal/tsm-2012-Jul-Aug-Sep.png', 'data/tsm/seasonal/tsm-2012-Oct-Nov-Dec.png', 'data/tsm/seasonal/tsm-2013-Apr-May-Jun.png', 'data/tsm/seasonal/tsm-2013-Jan-Feb-Mar.png'];
usort($allfiles, function($a, $b){
    $a_base = explode('-', ltrim(basename($a, '.png'), 'tsm-')); // trim those uneeded string parts
    $b_base = explode('-', ltrim(basename($b, '.png'), 'tsm-'));
    array_walk($a_base, 'change_months');
    array_walk($b_base, 'change_months'); // convert months to month number
    $a_base = (int) implode($a_base);
    $b_base = (int) implode($b_base); // glue them back again

    return $a_base - $b_base;
});

function change_months(&$val) {
    if(!is_numeric($val)) { // no need to convert the year
        $date_month = date_parse($val);
        $val = $date_month['month']; // get month number
        $val = ((strlen($val) == 1) ? '0'.$val : $val);
    }
}

echo '<pre>';
print_r($allfiles);

Should result into:

Array
(
    [0] => data/tsm/seasonal/tsm-2012-Jan-Feb-Mar.png
    [1] => data/tsm/seasonal/tsm-2012-Apr-May-Jun.png
    [2] => data/tsm/seasonal/tsm-2012-Jul-Aug-Sep.png
    [3] => data/tsm/seasonal/tsm-2012-Oct-Nov-Dec.png
    [4] => data/tsm/seasonal/tsm-2013-Jan-Feb-Mar.png
    [5] => data/tsm/seasonal/tsm-2013-Apr-May-Jun.png
)