imagerotate文档为第一个参数引用的类型与您使用的类型不同：
由图像创建功能之一（例如imagecreatetruecolor（））返回的图像资源。
function resample($jpgFile, $thumbFile, $width, $orientation) {
// Get new dimensions
list($width_orig, $height_orig) = getimagesize($jpgFile);
$height = (int) (($width / $width_orig) * $height_orig);
// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($jpgFile);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
// Fix Orientation
switch($orientation) {
case 3:
$image_p = imagerotate($image_p, 180, 0);
break;
case 6:
$image_p = imagerotate($image_p, -90, 0);
break;
case 8:
$image_p = imagerotate($image_p, 90, 0);
break;
}
// Output
imagejpeg($image_p, $thumbFile, 90);
}
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