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Kode 

<?php
/*************************************************************\* Image resizer, version 2.1 - May10,2003                     *
* Returns true on success, false if there are errors          *
* If destination file is specified, resized picture will be   *
* saved with the specified name. Else, it is shown to browser *
* Version 2: Now scales both up and down, still preserving    *
*            aspect ratio, and it accepts not only jpeg, but  *
*            also png and possibly bmp                        *
* Version 2.1: Genereal optimization and bugfixing.           *
*              No longer requires GD-lib to be >=2.0.1        *
}*************************************************************{
* Created by XyborX (www.xyborx.dk)                           *
* Feel free to use, modify and distribute, without profit.    *
* I cannot be held liable for any damage this script might do *
\\*************************************************************/
function imageresize($sourcefile,$maxwidth,$maxheight,$destinationfile=false)
{
    $types=Array();
    $types[1]='gif';
    $types[2]='jpeg';
    $types[3]='png';
    $types[6]='wbmp';
    list($width,$height,$type)=getimagesize($sourcefile);
    $type_name=$types[$type];
    $imagecreatefromtype='imagecreatefrom'.$type_name;
    $imagetype='image'.$type_name;
    if(!function_exists($imagecreatefromtype) || !function_exists($imagetype))
    {
        return false;
    }
    if($img_src=$imagecreatefromtype($sourcefile))
    {
        $ratio_height=$maxheight/$height;
        $ratio_width=$maxwidth/$width;
        $ratio=min($ratio_width,$ratio_height);
        $newwidth=$width*$ratio;
        $newheight=$height*$ratio;
        if(function_exists('imagecreatetruecolor'))
        {
            $img_dst=imagecreatetruecolor($newwidth,$newheight);
        }
        elseif(function_exists('imagecreate'))
        {
            $img_dst=imagecreate($newwidth,$newheight);
        }
        else
        {
            return false;
        }
        if(function_exists('imagecopyresampled'))
        {
            imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
				//imagedestroy($img_src);
            //imagedestroy($img_dst);
        }
        elseif(function_exists('imagecopyresized'))
        {
            imagecopyresized($img_dst, $img_src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
				//imagedestroy($img_src);
            //imagedestroy($img_dst);
        }
        else
        {
            imagedestroy($img_src);
            imagedestroy($img_dst);
            return false;
        }
        if($destinationfile==false)
        {
            header('Content-type: '.image_type_to_mime_type($type));
            $imagetype($img_dst);
        }
        else
        {
            $imagetype($img_dst,$destinationfile);
        }
        imagedestroy($img_src);
        imagedestroy($img_dst);
        return true;
    }
    else
    {
        return false;
    }
}
?>

imageresize("filen der oploades", "max bredde", "max højde", "filen flyttes til mappe + navn");