<?php

$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('');

$out = preg_replace($search, $replace, $document); 

echo $out;

?> 

存为.php