用php压缩时图像自行旋转

Question

我正在研究一个简单的php上传脚本。它工作正常。但是由于某些原因，图像被压缩后会旋转。有时它们会完全旋转180度，有时会旋转90度。为什么要这样做，我该如何停止呢？这是我的代码：

$name = ''; $type = ''; $size = ''; $error = '';

function compress_image($source_url, $destination_url, $quality) {
    $info = getimagesize($source_url);
    if ($info['mime'] == 'image/jpeg')
        $image = imagecreatefromjpeg($source_url);
    elseif ($info['mime'] == 'image/gif')
        $image = imagecreatefromgif($source_url);
    elseif ($info['mime'] == 'image/png')
        $image = imagecreatefrompng($source_url);


    imagejpeg($image, $destination_url, $quality);
    //echo "result ".$destination_url;
    //correctImageOrientation($destination_url);
     return $destination_url;
}

$url = 'test/compressed.jpg';

compress_image($_FILES["file"]["tmp_name"], $url, 30);