<? php
function  setupSize( $fileSize ) {    
     $size   =   sprintf ( " %u " ,   $fileSize );
     $sizename   =   array ( "  Bytes " ,   "  KB " ,   "  MB " ,   "  GB " ,   "  TB " ,   "  PB " ,   "  EB " ,   "  ZB " ,   "  YB " );    
     return   round ( $size / pow ( 1024 ,  ( $i   =   floor ( log ( $size ,   1024 )))) ,  3 )  .   $sizename [ $i ];
} 
echo  setupSize( ' 200000 ' )
?>