php使用正则去除网页中所有的 html,js,css,注释

$search = array ("'<script[^>]*?>.*?</script>'si",   // 去掉 javascript
                "'<style[^>]*?>.*?</style>'si",   // 去掉 css
                "'<[/!]*?[^<>]*?>'si",           // 去掉 HTML 标记
                "'<!--[/!]*?[^<>]*?>'si",           // 去掉 注释 标记
                "'([rn])[s]+'",                 // 去掉空白字符
                "'&(quot|#34);'i",                 // 替换 HTML 实体
                "'&(amp|#38);'i",
                "'&(lt|#60);'i",
                "'&(gt|#62);'i",
                "'&(nbsp|#160);'i",
                "'&(iexcl|#161);'i",
                "'&(cent|#162);'i",
                "'&(pound|#163);'i",
                "'&(copy|#169);'i",
                "'&#(d+);'e");                    // 作为 PHP 代码运行
 
$replace = array ("",
               "",
               "",
               "",
               "\1",
               "\"",
               "&",
               "<",
               ">",
               " ",
               chr(161),
               chr(162),
               chr(163),
               chr(169),
               "chr(\1)");
//$document为需要处理字符串，如果来源为文件可以$document = file_get_contents($filename);
$out = preg_replace($search, $replace, $document);

也可以使用php的内置函数strip_tags()清除html,js,注释等标记