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<?php
//renaming to bg.php
$dir = "walls/";
$files = scandir($dir);
$images = array_diff($files, ['.', '..']);
$name = $images[array_rand($images)];
// open the file in a binary mode
$fp = fopen($dir . $name, 'rb');
// send the right headers
header('Cache-Control: no-cache, no-store, must-revalidate'); // HTTP 1.1
header('Pragma: no-cache'); // HTTP 1.0
header('Expires: 0'); // Proxies
header('Content-Type: ' . $fp['type']);
header('Content-Length: ' . $fp['bytes']);
// dump the picture and stop the script
fpassthru($fp);
exit;
?>
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