Enregistrer une image depuis une balise img ou fpdf

$lienVersTonImage = "https://chart.googleapis.com/chart?cht=qr&chl=Cree%20le%3A%20<?= date("d"); ?>%2F<?= date("m")?>%2F<?= date("Y")?>%20a%20<?= $heure_sortie ?>%3B%0A%20Nom%3A%20<?= $nom[$id] ?>%3B%0A%20Prenom%3A%20<?= $prenom[$id] ?>%3B%0A%20Naissance%3A%20<?= $n[$id] ?>%20a%20<?= $l_n[$id] ?>%3B%0A%20Adresse%3A%20<?= $adresse[$id]." ".$postal[$id]." ".$ville[$id] ?>%3B%0A%20Sortie%3A%20<?= $date_sortie ?>%20a%20<?= $heure_sortie ?>%3B%0A%20Motifs%3A%20sport_animaux&chs=180x180&choe=UTF-8&chld=L|2";

$pdf-> Image($lienVersTonImage,100,15,35,35);

// just for demonstration purpose, the OP gets the content from a database instead
$h_img = fopen($lienVersTonImage, "rb");
$img = fread($h_img, filesize($lienVersTonImage));
fclose($h_img);

// prepare a base64 encoded "data url"
$pic = 'data://text/plain;base64,' . base64_encode($img);
// extract dimensions from image
$info = getimagesize($pic);

// create a simple pdf document to prove this is very well possible: 
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello Image!');
$pdf->Image($pic, 10, 30, $info[0], $info[1], 'jpg');
$pdf->Output();