A PHP script to send custom HTTP response

With the following php script one could request for a response with specific content-type, size and content-disposition.

Copy the below content to /var/www/html/askme.php and access http://server/askme.php?help

<?php


if(isset($_GET['help']))
{
    header("Content-type: text/html");
    echo "<h2>usage: http://" . $_SERVER["SERVER_NAME"] . $_SERVER["PHP_SELF"] . "?size=&lt;num>&lt;K|M|G>&type=&lt;content-type>&filename=&lt;name>" ;
    echo "<h2>example: http://" . $_SERVER["SERVER_NAME"] . $_SERVER["PHP_SELF"] . "?size=10K&type=image/png" ;
    exit;
}

if(isset($_GET['size'])) $size=$_GET['size']; else $size=0;
if(isset($_GET['type'])) $type=$_GET['type']; else $type="application/octet-stream";

header("Content-type: $type");
if(isset($_GET['filename']))
{
    header('Content-Disposition: attachment; filename="'. $_GET['filename'] .'"');
}

system ("dd if=/dev/zero bs=$size count=1");
?>