Render image not work properly (PHP & Linux)?

I have problem about rendering image in PHP. I use PHP 7.2 on Ubuntu OS. It work in my localhost and some server. but my NEW server give wrong value.

Here my code:

$fname = '/var/images/item.jpg';
$type = 'image/jpeg';
header('Content-Type:'.$type);         
header('Content-Length: ' . filesize($fname));
$img = file_get_contents($fname);
echo $img;

result:

I already installed php7.2-gd