PHP实现过滤各种HTML标签

首先分享一些比较常见的

1. $str=preg_replace("/<s*imgs+[^>]*?srcs*=s*('|")(.*?)\1[^>]*?/?s*>/i","", $str); //过滤img标签
   
2. 
   
3. $str=preg_replace("/s+/","", $str); //过滤多余回车
   
4. 
   
5. $str=preg_replace("/<[ ]+/si","<",$str); //过滤<__("<"号后面带空格)
   
6. 
   
7. $str=preg_replace("/<!--.*?-->/si","",$str); //注释
   
8. 
   
9. $str=preg_replace("/<(!.*?)>/si","",$str); //过滤DOCTYPE
   
10. 
    
11. $str=preg_replace("/<(/?html.*?)>/si","",$str); //过滤html标签
    
12. 
    
13. $str=preg_replace("/<(/?head.*?)>/si","",$str); //过滤head标签
    
14. 
    
15. $str=preg_replace("/<(/?meta.*?)>/si","",$str); //过滤meta标签
    
16. 
    
17. $str=preg_replace("/<(/?body.*?)>/si","",$str); //过滤body标签
    
18. 
    
19. $str=preg_replace("/<(/?link.*?)>/si","",$str); //过滤link标签
    
20. 
    
21. $str=preg_replace("/<(/?form.*?)>/si","",$str); //过滤form标签
    
22. 
    
23. $str=preg_replace("/cookie/si","COOKIE",$str); //过滤COOKIE标签
    
24. 
    
25. $str=preg_replace("/<(applet.*?)>(.*?)<(/applet.*?)>/si","",$str); //过滤applet标签
    
26. 
    
27. $str=preg_replace("/<(/?applet.*?)>/si","",$str); //过滤applet标签
    
28. 
    
29. $str=preg_replace("/<(style.*?)>(.*?)<(/style.*?)>/si","",$str); //过滤style标签
    
30. 
    
31. $str=preg_replace("/<(/?style.*?)>/si","",$str); //过滤style标签
    
32. 
    
33. $str=preg_replace("/<(title.*?)>(.*?)<(/title.*?)>/si","",$str); //过滤title标签
    
34. 
    
35. $str=preg_replace("/<(/?title.*?)>/si","",$str); //过滤title标签
    
36. 
    
37. $str=preg_replace("/<(object.*?)>(.*?)<(/object.*?)>/si","",$str); //过滤object标签
    
38. 
    
39. $str=preg_replace("/<(/?objec.*?)>/si","",$str); //过滤object标签
    
40. 
    
41. $str=preg_replace("/<(noframes.*?)>(.*?)<(/noframes.*?)>/si","",$str); //过滤noframes标签
    
42. 
    
43. $str=preg_replace("/<(/?noframes.*?)>/si","",$str); //过滤noframes标签
    
44. 
    
45. $str=preg_replace("/<(i?frame.*?)>(.*?)<(/i?frame.*?)>/si","",$str); //过滤frame标签
    
46. 
    
47. $str=preg_replace("/<(/?i?frame.*?)>/si","",$str); //过滤frame标签
    
48. 
    
49. $str=preg_replace("/<(script.*?)>(.*?)<(/script.*?)>/si","",$str); //过滤script标签
    
50. 
    
51. $str=preg_replace("/<(/?script.*?)>/si","",$str); //过滤script标签
    
52. 
    
53. $str=preg_replace("/javascript/si","Javascript",$str); //过滤script标签
    
54. 
    
55. $str=preg_replace("/vbscript/si","Vbscript",$str); //过滤script标签
    
56. 
    
57. $str=preg_replace("/on([a-z]+)s*=/si","On\1=",$str); //过滤script标签
    
58. 
    
59. $str=preg_replace("/&#/si","&＃",$str); //过滤script标签

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更简单些的写法：

1. function delhtml($str){  //清除html标签
   
2. $st=-1; //开始
   
3. $et=-1; //结束
   
4. $stmp=array();
   
5. $stmp[]=" ";
   
6. $len=strlen($str);
   
7. for($i=0;$i<$len;$i++){
   
8.   $ss=substr($str,$i,1);
   
9.   if(ord($ss)==60){ //ord("<")==60
   
10.   $st=$i;
    
11.   }
    
12.   if(ord($ss)==62){ //ord(">")==62
    
13.   $et=$i;
    
14.   if($st!=-1){
    
15.    $stmp[]=substr($str,$st,$et-$st+1);
    
16.   }
    
17.   }
    
18. }
    
19. $str=str_replace($stmp,"",$str);
    
20. return $str;
    
21. }

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再来一个

1. function clear_html_label($html)
   
2. {
   
3. $search = array ("'<script[^>]*?>.*?</script>'si", "'<[/!]*?[^<>]*?>'si", "'([rn])[s]+'", "'&(quot|#34);'i", "'&(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");
   
4. $replace = array ("", "", "1", """, "&", "<", ">", " ", chr(161), chr(162), chr(163), chr(169), "chr(1)");
   
5. return preg_replace($search, $replace, $html);
   
6. }

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以上三种方法均可以实现，不过各有优劣，小伙伴们根据自己的项目需求来选择吧。