PHP: Minify CSS

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// from here: http://www.concrete5.org/documentation/how-tos/developers/dynamically-concatenate-minify-gzip-and-server-side-cache-multip/

function minifyCSS($css) {
    $css = trim($css);
    $css = str_replace("\r\n", "\n", $css);
    $search = array("/\/\*[^!][\d\D]*?\*\/|\t+/", "/\s+/", "/\}\s+/");
    $replace = array(null, " ", "}\n");
    $css = preg_replace($search, $replace, $css);
    $search = array("/;[\s+]/", "/[\s+];/", "/\s+\{\\s+/", "/\\:\s+\\#/", "/,\s+/i", "/\\:\s+\\\'/i", "/\\:\s+([0-9]+|[A-F]+)/i", "/\{\\s+/", "/;}/");
    $replace = array(";", ";", "{", ":#", ",", ":\'", ":$1", "{", "}");
    $css = preg_replace($search, $replace, $css);
    $css = str_replace("\n", null, $css);
    return $css;
}