There are quite a few options that can be used: (both tested).
Here are two ways.
header("Content-type: application/pdf");
header("Content-Disposition: inline; filename=filename.pdf");
@readfile('pathofilename.pdf');
or: (note the escaped double-quotes). The same need to be use when assigning a name to it.
<?php
echo "<iframe src="file.pdf" width="100%" style="height:100%"></iframe>";
?>
I.e.: name="myiframe" id="myiframe"
would need to be changed to:
name="myiframe" id="myiframe" inside PHP.
Be sure to have a look at: this answer on SO for more options on the subject.
Footnote: There are known issues when trying to view PDF files in Windows 8. Installing Adobe Acrobat Reader is a better method to view these types of documents if no browser plug-ins are installed.
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