<?php
header('Content-type: text/css');
ob_start("compress");

    function compress( $min ){
        $min = preg_replace( '!/*[^*]**+([^/][^*]**+)*/!', '', $min );
        $min = str_replace( array("rn", "r", "n", "t", '  ', '    ', '    '), '', $min );
        return $min;
    }

    include('stylesheet-1.css');
    include('stylesheet-2.css');
    include('stylesheet-3.css');

ob_end_flush();
?>