Human readable file size

This function return formatting of file sizes in a human readable format.

function formatFileSize( $size )
{
   $file_size = $size;
   $i = 0;
 
   $name = array( 'byte', 'kB', 'MB', 'GB' );
 
   while ( $file_size > 1000 ) {
      $i++;
      $file_size = $file_size / 1024;
   }
 
   return round( $file_size, 2 ) . " " . $name[$i];
 
}
 
echo formatFileSize( 1024 * 1024 ); //out = 1 MB