我正在编写一个简单的php上传脚本。很好用。但由于某种原因，当图像被压缩时，它们会旋转。有时它们完全旋转180度，有时90度。它为什么要这样做？我该怎么阻止它？这是我的密码：

$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);