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Код

//GD lib
///resize class
class thumbnail
{
 var $img;

function thumbnail($imgfile)
{
 $this->img["format"]=ereg_replace(".*\.(.*)$","\\1",$imgfile);
 $this->img["format"]=strtoupper($this->img["format"]);
 if ($this->img["format"]=="JPG" || $this->img["format"]=="JPEG") {
 //JPEG
  $this->img["format"]="JPEG";
  $this->img["src"] = ImageCreateFromJPEG ($imgfile);
 } 
 elseif ($this->img["format"]=="PNG") {
 //PNG
  $this->img["format"]="PNG";
  $this->img["src"] = ImageCreateFromPNG ($imgfile);
 } 
 elseif ($this->img["format"]=="GIF") {
//GIF
  $this->img["format"]="GIF";
  $this->img["src"] = ImageCreateFromGIF ($imgfile);
 } 
 elseif ($this->img["format"]=="WBMP") {
 //WBMP
  $this->img["format"]="WBMP";
  $this->img["src"] = ImageCreateFromWBMP ($imgfile);
 }
@$this->img["lebar"] = imagesx($this->img["src"]);
@$this->img["tinggi"] = imagesy($this->img["src"]);
$this->img["quality"]=100;
}

function size_auto($size=100)
{
//size
 if ($this->img["lebar"]>=$this->img["tinggi"]) 
 {
    $this->img["lebar_thumb"]=$size;
    @$this->img["tinggi_thumb"] = ($this->img["lebar_thumb"]/$this->img["lebar"])*$this->img["tinggi"];
 } 
 else 
 {
    $this->img["tinggi_thumb"]=$size;
    @$this->img["lebar_thumb"] = ($this->img["tinggi_thumb"]/$this->img["tinggi"])*$this->img["lebar"];
 }
}

function jpeg_quality($quality=100)
{
 $this->img["quality"]=$quality;
}

function show()
{
//show thumb
@Header("Content-Type: image/".$this->img["format"]);

/* change ImageCreateTrueColor to ImageCreate if your GD not supported ImageCreateTrueColor function*/
$this->img["des"] = ImageCreateTrueColor($this->img["lebar_thumb"],$this->img["tinggi_thumb"]);
    @imagecopyresized ($this->img["des"], $this->img["src"], 0, 0, 0, 0, $this->img["lebar_thumb"], $this->img["tinggi_thumb"], $this->img["lebar"], $this->img["tinggi"]);

if ($this->img["format"]=="JPG" || $this->img["format"]=="JPEG") {
//JPEG
imageJPEG($this->img["des"],"",$this->img["quality"]);
} elseif ($this->img["format"]=="PNG") {
//PNG
imagePNG($this->img["des"]);
} elseif ($this->img["format"]=="GIF") {
//GIF
imageGIF($this->img["des"]);
} elseif ($this->img["format"]=="WBMP") {
//WBMP
imageWBMP($this->img["des"]);
}
}

function save($save="")
{
//save thumb
if (empty($save)) $save=strtolower("./thumb.".$this->img["format"]);
/* change ImageCreateTrueColor to ImageCreate if your GD not supported ImageCreateTrueColor function*/
$this->img["des"] = ImageCreateTrueColor($this->img["lebar_thumb"],$this->img["tinggi_thumb"]);
    @imagecopyresized ($this->img["des"], $this->img["src"], 0, 0, 0, 0, $this->img["lebar_thumb"], $this->img["tinggi_thumb"], $this->img["lebar"], $this->img["tinggi"]);

if ($this->img["format"]=="JPG" || $this->img["format"]=="JPEG") {
//JPEG
imageJPEG($this->img["des"],"$save",$this->img["quality"]);
} elseif ($this->img["format"]=="PNG") {
//PNG
imagePNG($this->img["des"],"$save");
} elseif ($this->img["format"]=="GIF") {
//GIF
imageGIF($this->img["des"],"$save");
} elseif ($this->img["format"]=="WBMP") {
//WBMP
imageWBMP($this->img["des"],"$save");
}
}
}
///end class