for($n=0; $n<count($files); $n++)
{
$dir_ret = opendir("./$trumb_dir/");
closedir ($dir_ret);
if($dir_ret == False ) mkdir($trumb_dir);
if(!file_exists("./$trumb_dir/$files[$n]"))
{
if(eregi(".jpg$|.jpeg$",$files[$n]))
{
$size = getimagesize($files[$n]);
$t=imagecreate($trumb_size_x,$trumb_size_y);
$b=imagecreatefromjpeg($files[$n]);
imagecopyresized($t,$b,0,0,0,0,$trumb_size_x,$trumb_size_y,$size[0],$size[1]);
imagejpeg($t,"./$trumb_dir/".$files[$n],$jpg_quality);
}}}

<?php
function create_tmb($bigimgsrc,$trumbalis)
{
global $jpg_quality,$trumb_size_x;
$rgb = 0xFFFFFF;
$width = 120;
$size = @getimagesize($bigimgsrc);

$format = strtolower(substr($size['mime'], strpos($size['mime'], '/')+1));
$icfunc = "imagecreatefrom" . $format;
if (!function_exists($icfunc)) return false;

$x_ratio = $size[0]/$trumb_size_x;
$height = floor($size[1]/$x_ratio);

$trumbcreate = imagecreatetruecolor($trumb_size_x, $height);
$bigimg = $icfunc($bigimgsrc);

imagecopyresized($trumbcreate, $bigimg, 0, 0, 0, 0, $trumb_size_x, $height, $size[0], $size[1]);
imagejpeg($trumbcreate,$trumbalis,$jpg_quality);
flush();
imagedestroy($bigimg);
imagedestroy($trumbcreate);
return true;
}
function getmicrotime(){
list($usec, $sec) = explode(" ",microtime());
return ((float)$usec + (float)$sec);
}
?>