PHP Validate Uploaded File is PDF

[phpnewbie08]

How do I check if the uploaded file is pdf with php? I want to validate the file type is pdf and not just the extension matches pdf.


thanks.

[phpnewbie08]

Just to clarify. I need to validate 2 files and send them with phpmailer to an email address. Will the below works?

if(isset($_FILES['upload']['tmp_name'])){
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$mime=finfo_file($finfo, $_FILES['upload']['tmp_name']);
if($mime=='application/pdf'){
$mail->AddAttachment($mime);
} } }
finfo_close($finfo);
}