从数据库旋转图像并保存到数据库blob类型

Question

将图像保存到数据库

$query =$myClass->query("insert into tblImage(document) values(".base64_encode(file_get_contents($_FILES['imageFile']["tmp_name"])).")");   

从数据库显示图像

$image =$myClass->query("select document from  tblImage where code=1");                                                                             
$output_bin_string = base64_decode($image[0]['thumbDocument']);
header("Content-Type: image/jpeg");
header("Content-Length: " . strlen($output_bin_string));          
echo $output_bin_string;    

我可以将图像保存到文件，然后保存到数据库

$image=$myClass->query('select document form tblImage where code=1' );   
$source = imagecreatefromstring(base64_decode($image[0]["document"])) ;
$rotate = imagerotate($source,$degrees,0);
imagejpeg($rotate,'tmp/1.jpg');
$image =$myClass->query("update tblImage set document='".base64_encode(file_get_contents('tmp/1.jpg'))."'   where code=1");

问题：有一种方法可以旋转图像并保存到数据库而无需像这样保存图像

$image=$myClass->query('select document form tblImage where code=1' );   
$source = imagecreatefromstring(base64_decode($image[0]["document"])) ;
$rotate = imagerotate($source,$degrees,0);
$image =$myClass->query("update tblImage set document='".base64_encode($rotate)."'   where code=1");

此代码说错误：base64_encode() expects parameter 1 to be string, resource given