Create multipage pdf from TIFFs

I need to create a multipage pdf file from several TIFFs and get the resulting string using Imagick Library and PHP.
So far I have tried this:

$files = array('00003470.TIF','00003471.TIF','00003472.TIF');
$document = new Imagick($files); 
$document->setImageFormat("pdf");
$s=$document->getImagesBlob();
header("Content-type: application/pdf");
header("Content-Length: ".strlen($s));
header("Content-Disposition: attachment; filename=\"test.pdf\"");
echo $s;

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It works for a single tiff, but if I add more tiffs, then I get "Currupted PDF". Does anyone know how to do this?
LVL 6
Ludwig DiehlSystems ArchitectAsked:
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Ludwig DiehlSystems ArchitectAuthor Commented:
I found the solution!. I had to call "resetiterator" method after constructor and it works perfect!. Thanks anyway!
  
       $filename="tmp/";
        $filename.=sha1(microtime(true));
        $document = new Imagick($files);
        $document->resetiterator();
        $document->setimageformat('pdf');      
        $s=$document->getImagesBlob(); 
        header("Content-type: application/pdf");
        header("Content-Length: ".strlen($s));
        header("Content-Disposition: attachment; filename=\"test.pdf\"");
echo $s;

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Ludwig DiehlSystems ArchitectAuthor Commented:
It works like a charm!
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