去除所有js,html,css代码

$search = array ("''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);