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Képátméretezés

/*
*    @input: $filename - a méretezendő fájl neve és elérési útja (images/image.jpg)
*                   $dest - a mentendő fájl helye
*                   $width - szélesség px-ben
*                   $height - magasság px-ben
*                   $pictype - "thumb" vagy "". Ha thumb akkor a 
*                                  magasság és szélesség is kell, s a 
*                                  kép arányainak megfelelően kalkulál
*/

function resize($filename, $dest, $width, $height = "", $pictype = "")
 {
 $filename='frontend_images/headers/'.$filename;
 $dest='frontend_images/headers/'.$dest;
 $format = strtolower(substr(strrchr($filename,"."),1));
 switch($format)
 {
 case 'gif' :
 $type ="gif";
 $img = imagecreatefromgif($filename);
 break;
 case 'png' :
 $type ="png";
 $img = imagecreatefrompng($filename);
 break;
 case 'jpg' :
 $type ="jpg";
 $img = imagecreatefromjpeg($filename);
 break;
 case 'jpeg' :
 $type ="jpg";
 $img = imagecreatefromjpeg($filename);
 break;
 default :
 die ("ERROR; UNSUPPORTED IMAGE TYPE, format:".$format);
 break;
 }
 
 list($org_width, $org_height) = getimagesize($filename);
 $xoffset = 0;
 $yoffset = 0;
 
 if($height == "")
 {
 $height=$org_height / ($org_width / $width);
 }
 
 if ($pictype == "thumb")
 {
 if ($org_width / $width > $org_height/ $height)
 {
 $xtmp = $org_width;
 $xratio = 1-((($org_width/$org_height)-($width/$height))/2);
 $org_width = $org_width * $xratio;
 $xoffset = ($xtmp - $org_width)/2;
 }
 elseif ($org_height/ $height > $org_width / $width)
 {
 $ytmp = $org_height;
 $yratio = 1-((($width/$height)-($org_width/$org_height))/2);
 $org_height = $org_height * $yratio;
 $yoffset = ($ytmp - $org_height)/2;
 }
 } else {   
 $xtmp = $org_width/$width;
 $new_width = $width;
 $new_height = $org_height/$xtmp;
 if ($new_height > $height){
 $ytmp = $org_height/$height;
 $new_height = $height;
 $new_width = $org_width/$ytmp;
 }
 $width = round($new_width);
 $height = round($new_height);
 }
 
 
 $img_n=imagecreatetruecolor ($width, $height);
 imagecopyresampled($img_n, $img, 0, 0, $xoffset, $yoffset, $width, $height, $org_width, $org_height);
 
 if($type=="gif")
 {
 imagegif($img_n, $dest.'.'.$type);
 }
 elseif($type=="jpg")
 {
 imagejpeg($img_n, $dest.'.'.$type);
 }
 elseif($type=="png")
 {
 imagepng($img_n, $dest.'.'.$type);
 }
 elseif($type=="bmp")
 {
 imagewbmp($img_n, $dest.'.'.$type);
 }

 Return $dest.'.'.$type;
 }