<?php
$target = "files/";
$target = $target . basename( $_FILES['uploaded']['name']);
$ok=1;
$fsize = $_FILES["uploaded"]["size"];
$uploaded_type = $_FILES["uploaded"]["type"];

if($fsize == 0 || $fsize > 2621000) exit("keep the filesize under 2,50MB!!");

//if ($uploaded_type!="application/pdf") exit("Only Pdf files!!");
$fp = fopen('$target'); $header = fread($fp,6); if($header!=='%PDF-1') { echo "PDF ONLY!"; }
fclose($fp);
if ($ok==0)
{
Echo "Sorry your file was not uploaded";
}

//If everything is ok we try to upload it
else
{
if(move_uploaded_file($_FILES['uploaded']['tmp_name'], $target))
{
echo "The file ". basename( $_FILES['uploadedfile']['name']). " has been uploaded";
}
else
{
echo "Sorry, there was a problem uploading your file.";
}
}