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$filename = 'photo/898.gif';
$info = getimagesize($filename);
$width_old = $info[0];
$height_old = $info[1];
$type = $info[2];
switch ($type) {
case 1:
$img = imageCreateFromGif($filename);
imageSaveAlpha($img, true);
break;
case 2:
$img = imageCreateFromJpeg($filename);
break;
case 3:
$img = imageCreateFromPng($filename);
imageSaveAlpha($img, true);
break;
}
$width_new = "500";
$k_width = ($width_old / $width_new);
$height_new = ceil($height_old / $k_width);
$tmp = imageCreateTrueColor($width_new, $height_new);
imageCopyResampled($tmp, $img, 0, 0, 0, 0, $width_new, $height_new, $width_old, $height_old);
unlink($filename);
if ($type == 1) imageGif ($tmp, $filename);
if ($type == 2) imagejpeg($tmp, $filename);
if ($type == 3) imagePng ($tmp, $filename);
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