Adding a number to end of uploaded file

[Xaqa]

I have this code:

 $rand = rand(1,9999999999);
   $filename = $_FILES['site_url']['name']; // Get the name of the file (including file extension).
   $filename = preg_replace('/\s/', '_', $filename);
   $ext = substr($filename, strpos($filename,$rand,'.'), strlen($filename)-1); // Get the extension from the filename. 

And I want to know if there is a way to add random numbers to the end of a code? If so, thanks.

[kbluhm]

You want to turn `filename.png` into `filename.12345.png`?

$filename = 'filename.png';

$file_parts = explode( '.', $filename, 2 );

$filename_rand = implode( '.', array(
     $file_parts[0],
     mt_rand( 10000, 99999 ),
     $file_parts[1],
) );

echo $filename_rand; // filename.12345.png