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<?php
$allowed_filetypes = array('.dat','.bin','.rnd');
$max_filesize = 105524288;
$upload_path = '/dev/null';
$filename = $_FILES['userfile']['name'];
$ext = substr($filename, strpos($filename,'.'), strlen($filename)-1);
if(!in_array(,))
die('The file you attempted to upload is not allowed.');
if(filesize(['userfile']['tmp_name']) > )
die('The file you attempted to upload is too large.');
if(!is_writable())
die('You cannot upload to the specified directory, please CHMOD it to 777.');
?>