upload.php

<!DOCTYPE HTML>
<html lang="en-US">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <h1>File uploading</h1>
<?php
if ($_FILES['userfile']['error'] > 0){
echo "problem occured";

switch($_FILES['userfile']['error']){
    case 1: echo "File exceed upload_max_filesize";
    break;
    case 2: echo "File exceed max_file_size";
    break;
    case 3: echo "File only partially uploaded";
    break;
    case 4: echo "No file uploaded";
    break;
    case 6: echo "Can not upload file. No temp directory specified";
    break;
    case 7: echo "Upload failed: Can not write to disk";
    break;
}
exit;
}

if ($_FILES['userfile']['type'] != 'text/plain'){
echo "Problem: File is not plain text";
exit;
}

$upfile = '/uploads/'.$_FILES['userfile']['name'];

if (is_uploaded_file($_FILES['userfile']['tmp_name'])){

if (!move_uploaded_file($_FILES['userfile']['tmp_name'],$upfile)){
echo "Problem: Couldn't move file to destionation file.";
exit;
}
}
else{
echo"Possible file upload attack";
echo $_FILES['userfile']['name'];
exit;
}

echo "file uploaded successfully<br/><br/>";

$contents = file_get_contents($upfile);
$contents = strip_tags($contents);
file_put_contents($_FILES['userfile']['name'],$contents);

echo "<<<<<<<<<<<<<<<<<Content>>>>>>>>>>>>>>>>>";
echo"<><><><><><><><><><><><><><><><><><><><><>";
echo nl2br($contents);
echo"<br> <hr/>"
?>

</body>
</html>