fileinfo not restricting pdf only - php

Question

I am using the below script to validate if the uploaded files are pdf and if it is send it with phpmailer. It send the email but there is no attachment. Also, it allows me to attach non pdf files as well. Please help.
ob_start();
require("class.phpmailer.php");
if(isset($_FILES['upload']['tmp_name'])){
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$mime=finfo_file($finfo, $_FILES['upload']['tmp_name']);
if($mime=='application/pdf'){
$message = "some message";
$mail = new PHPMailer();
$mail->From = ('sample#youdomain.net');
$mail->AddAddress=('sample#youdomain.net');
$mail->Subject = "Submitted files";
$mail->Body = $message;
$mail->WordWrap = 50;
foreach($_FILES['upload']['tmp_name'] as $upload)
if(!empty($upload)) {
$mail->AddAttachment($upload);
}
$mail->Send();
header("Location: thankyou.php");
exit();
}}

Answer 1

Currently you have:
if( ... ) {
...
if($mime=='application/pdf') {
}
}
// some code you want to be executed
// only if the mime type is application/pdf
But you want:
if (...) {
..
if ($mime=='application/pdf') {
// place the code you want to be executed
// only if the mime type is application/pdf
// here - before the closing }
}
}