function compress_html($string) {
    $string = str_replace("\r\n", '', $string); //清除换行符
    $string = str_replace("\n", '', $string); //清除换行符
    $string = str_replace("\t", '', $string); //清除制表符
    $pattern = array (
                    "/> *([^ ]*) *</", //去掉注释标记
                    "/[\s]+/",
                    "/<!--[\\w\\W\r\\n]*?-->/",
                    "/\" /",
                    "/ \"/",
                    "'/\*[^*]*\*/'"
                    );
    $replace = array (
                    ">\\1<",
                    " ",
                    "",
                    "\"",
                    "\"",
                    ""
                    );
    return preg_replace($pattern, $replace, $string);
}