php dir list and sort by date

Even though the php dir function works straight from the box, it won't be very much help when you'll start thinking of sorting a file list by modification date of the file. here is a piece of code and a few functions that do the trick

function comparar($a, $b)
{
return strnatcasecmp($b["1"], $a["1"]); //reversed to order from newest to oldest, change to ($a["1"], $b["1"]) to do oldest to newest
}
$default_dir = "."; //current directory
$dirlist = array(); //make new array
$dir = dir($default_dir);
while($file = $dir->read()) //read directory
{
if(0 != strpos($file, '.demo')) //if filename has .demo in it continue
{
$lastmodified = filemtime($file); //find filetime in milliseconds
$dirlist[] = array($file, $lastmodified); //put these into array
}
}
$dir->close();
usort($dirlist, "comparar"); //send array to usort
$arraynum = sizeof($dirlist); //how many entities the array contains
$i = 0;
while($i < $arraynum) { $curList = $dirlist[$i]; //set current array to access $curFile = $curList[0]; //access that array's first array $curTime = $curList[1]; //access that array's second array $curDate = date("m/d/y", $curTime); //convert time into something readable echo " $curFile $curDate";
$i = $i + 1; //next $i
}