open pdf within browser via php code

Using PHP code I have created a pdf document and stored it as a file on our server.

I can open the pdf file within the browser if I access it via it's url
I can email it as an attachment and successfully open

However
I can't open the pdf in the browser window via a php call.

I get the following error "File doesn't begin with '%PDF-'

I have tried the following options   ($file is a variable)

option 1      
        header('Content-Disposition: inline; filename="'.$file.'"');
      header('Content-Type: application/pdf');
      header('Content-Length: '.filesize($file));
      readfile($file);

option 2
       header("Content-type: application/pdf");
       header("Content-Disposition: inline; filename=".$file);
       readfile($file);

option 3
       header("Content-Type: application/pdf");
       header("Cache-Control: no-cache");
       header("Accept-Ranges: none");
       header("Content-Disposition: attachment; filename=\"".$file."\"");

I have also attempted to use absolute references rather than the variable '$file' but I haven't been successful

thanks
joomlaAsked:
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GaryConnect With a Mentor Commented:
Microsoft Security Essentials - been using it over a year and never an infection and its free (I know what you mean about Kaspersky - and McAfee)
Also AVG - has a free version.
Depends how much you want to spend or not spend.

Yep that code works fine - but I'm on PDF 10
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GaryCommented:
Tested your first option and it works as it should.
Check you are not using an old version of pdf reader.
Assuming you have nothing else in the php page...?
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joomlaAuthor Commented:
Is there a way to make it version irrelevant ?
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gr8gonzoConsultantCommented:
I'm guessing that it's probably a missing file / path issue. To confirm that, add this before the first header() in option 1:

if(!file_exists($file))
{
  echo "{$file} does not exist!";
  die();
}
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GaryCommented:
What browser are you using? What version of PDF reader?
Assuming gr8gonzo is wrong and you do have the correct file path....
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joomlaAuthor Commented:
Hi
thanks gr8gonzo, but the path is correct, however I appreciate the feedback.

application:  DOMPDF
version:   PDF 1.3   (acrobat 4.x)

I should point out, it opens if sent as an attachment and or if I click on the link

regards
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GaryCommented:
1.3 - are you sure?
That's 13 years old, and probably the reason. Earlier version of PDF reader had problems with IE's ActiveX
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joomlaAuthor Commented:
sorry for the slow response
using adobe acrobat professional seems to give the same result

I tried downloading/installing latest version of reader but Kasparskey locked my machine and I had to restart

Can anyone recommend a better anti-virus as I'm running out of tolerance for K.

Can you confirm that the following code block works for you ?

      header('Content-Disposition: inline; filename="'.$file.'"');
      header('Content-Type: application/pdf');
      header('Content-Length: '.filesize($file));
      readfile($file);
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joomlaAuthor Commented:
thanks for your help
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