To show image in page
<img src="https://graph.facebook.com/{{fid}}/picture">
To save
$image = file_get_contents('https://graph.facebook.com/'.$fid.'/picture?type=large');
$dir = dirname(__file__).'/avatar/'.$fid.'.jpg';
file_put_contents($dir, $image);
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solved How to get a Facebook user’s profile picture in php