手机照片的exif里有方向属性

<?php
$image = imagecreatefromstring(file_get_contents($_FILES['image_upload']['tmp_name']));
$exif = exif_read_data($_FILES['image_upload']['tmp_name']);
if(!empty($exif['Orientation'])) {
 switch($exif['Orientation']) {
  case 8:
   $image = imagerotate($image,90,0);
   break;
  case 3:
   $image = imagerotate($image,180,0);
   break;
  case 6:
   $image = imagerotate($image,-90,0);
   break;
 }
}
// $image now contains a resource with the image oriented correctly
?>

需要上传之后改变一下属性，详见“七夕出租”游戏；

2.js返回上一页并刷新：

onclick="self.location=document.referrer;"