script PHP script to join multiple css files into one file, compress with gzip, set expiration headers

[GumSlone]

Speed Up your sites with the script below.

Join multiple css files into one file, compress them with gzip and set expiration header

replace

include('./css/file1.css');
include('./css/file2.css');
include('./css/file3.css'); 

with your css files,
PS. if you use images like in your css files you might need to update the relative path of the images in your css to work properly.

<?php
$offset = 60 * 60 * 24 * 30; // Cache for a day
header("Content-type: text/css");
header ("Cache-Control: max-age=" . $offset . ", must-revalidate");
header ("Expires: " . gmdate ("D, d M Y H:i:s", time() + $offset) . " GMT");
function compress($buffer) {
    /* remove comments */
    $buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer);
    /* remove tabs, spaces, newlines, etc. */
    $buffer = str_replace(array("\r\n", "\r", "\n", "\t", '  ', '    ', '    '), '', $buffer);
    $buffer = str_replace(array(";}", "; }"), '}', $buffer);
    $buffer = str_replace(array('} ', ' }'), '}', $buffer);
    $buffer = str_replace(array('{ ',' {'), '{', $buffer);
    $buffer = str_replace('( ', '(', $buffer);
    $buffer = str_replace(' )', ')', $buffer);
    $buffer = str_replace(array(': ',' :'), ':', $buffer);
    $buffer = str_replace(array('("','(\''), '(', $buffer);
    $buffer = str_replace(array('")','\')'), ')', $buffer);
    $buffer = str_replace(array(', ',' ,'), ',', $buffer);
    $buffer = str_replace(array('; ',' ;'), ';', $buffer);
    
    //$buffer = preg_replace("/url\(("|'|)((.*\.(png|gif|jpg))("|'|))\)/Uie", "image_to_base64('$3','$4')", $buffer);
    
    return $buffer;
}
function image_to_base64($image_url,$image_type)
{
    if(file_exists($image_url))
    {
        $size = filesize($image_url);
        if(round($size/1024, 2)<6)
        {
            $image_type = str_replace('jpg','jpeg',$image_type);
            return 'url(\'data:image/'.$image_type.';base64,'.base64_encode(file_get_contents($image_url)).'\')';
        }
        else
            return 'url(\''.$image_url.'\')';
    }
    else
        return 'url(\''.$image_url.'\')';
}

ob_start();
include('./css/file1.css');
include('./css/file2.css');
include('./css/file3.css');
$out = ob_get_contents();
ob_end_clean();
$out = compress($out);

if(strstr($_SERVER["HTTP_ACCEPT_ENCODING"],"gzip"))
{
    header("Content-Encoding: gzip");
    header("Vary: Accept-Encoding");
    ob_start('ob_gzhandler');
}
echo $out;

?>

[karson]

thanks GumSlone . it is very interesting idea