Minify CSS

.htaccess

RewriteEngine On
RewriteRule ^styles.min.css$ styles.min.php [L]

styles.min.php

<?php

$files = array(
  'style.css'
  ,'jquery.ui.custom.css'
);
    
$modified = 0;

foreach($files as $file)
{        
  $age = filemtime($file);
  if($age > $modified)
  {
    $modified = $age;
  }
}

$offset = 60 * 60 * 24 * 7; // Cache for 1 week
header ('Expires: ' . gmdate ("D, d M Y H:i:s", time() + $offset) . ' GMT');

if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $modified)
{
    header("HTTP/1.0 304 Not Modified");
    header ('Cache-Control:');
} 
else 
{
  header ('Cache-Control: max-age=' . $offset);
  header ('Content-type: text/css; charset=UTF-8');
  header ('Pragma:');
  header ("Last-Modified: ".gmdate("D, d M Y H:i:s", $modified )." 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);
    /* remove other spaces before/after ; */
    $buffer = preg_replace(array('(( )+{)','({( )+)'), '{', $buffer);
    $buffer = preg_replace(array('(( )+})','(}( )+)','(;( )*})'), '}', $buffer);
    $buffer = preg_replace(array('(;( )+)','(( )+;)'), ';', $buffer);
    return $buffer;
  }
  
  ob_start('ob_gzhandler');
  
  foreach($files as $file)
  {
    //compress files that aren't minified
    if(strpos(basename($file),'.min.')===false) 
    {
      ob_start("compress");
      include($file);
      ob_end_flush();
    } 
    else
    {
      include($file);
    }
  }
  
  ob_end_flush();
}

Thx!