public function img_resize($src, $dst, $width, $height, $crop=0){
        $gis = getimagesize($src);
        $w = $gis[0]; $h = $gis[1];

  $type = $gis[2];
  switch($type){
    case '6': $img = imagecreatefromwbmp($src); break;
    case '1': $img = imagecreatefromgif($src); break;
    case '2': $img = imagecreatefromjpeg($src); break;
    case '3': $img = imagecreatefrompng($src); break;
    default : return "Unsupported picture type!";
  }

  // resize
  if($crop){
    if($w < $width or $h < $height) {
        $w = $width ; $h = $height;
        $x = 0;
    } else {
        $ratio = max($width/$w, $height/$h);
        $h = $height / $ratio;
        $x = ($w - $width / $ratio) / 2;
        $w = $width / $ratio;
    }
  }
  else{
    if($w < $width and $h < $height) {
        $height = $h; $width = $w;
        $x = 0;
    } else {
        $ratio = min($width/$w, $height/$h);
        $width = $w * $ratio;
        $height = $h * $ratio;
        $x = 0;
    }
  }

  $new = imagecreatetruecolor($width, $height);

  // preserve transparency
  if($type == 1 or $type == 3){
    imagecolortransparent($new, imagecolorallocatealpha($new, 255, 255, 255, 127));
    imagealphablending($new, false);
    imagesavealpha($new, true);
  }

  imagecopyresampled($new, $img, 0, 0, $x, 0, $width, $height, $w, $h);

  switch($type){
    case '6': imagewbmp($new, $dst); break;
    case '1': imagegif($new, $dst); break;
    case '2': imagejpeg($new, $dst); break;
    case '3': imagepng($new, $dst); break;
  }
  return true;
}

}