strip_tags函数

strip_tags --- 去除字串中的HTML和PHP标签

语法:string strip_tags (string str [, string allowable_tags])

例,代码如下:

1. <?php
2. $text = '<p>Test paragraph.</p><!-- Comment --> <a href="#fragment">Other text</a>';
3. echo strip_tags($text);
4. echo "n";
5. // Allow <p> and <a>
6. echo strip_tags($text, '<p><a>');
7. ?>

正则过滤各种标签,空格,换行符,代码如下:

1. $str=preg_replace("/s+/", " ", $str); //过滤多余回车
2. $str=preg_replace("/<[ ]+/si","<",$str); //过滤<__("<"号后面带空格)
3. $str=preg_replace("/<!–.*?–>/si","",$str); //注释
4. $str=preg_replace("/<(!.*?)>/si","",$str); //过滤DOCTYPE
5. $str=preg_replace("/<(/?html.*?)>/si","",$str); //过滤html标签
6. $str=preg_replace("/<(/?head.*?)>/si","",$str); //过滤head标签
7. $str=preg_replace("/<(/?meta.*?)>/si","",$str); //过滤meta标签
8. $str=preg_replace("/<(/?body.*?)>/si","",$str); //过滤body标签
9. $str=preg_replace("/<(/?link.*?)>/si","",$str); //过滤link标签
10. $str=preg_replace("/<(/?form.*?)>/si","",$str); //过滤form标签
11. $str=preg_replace("/cookie/si","COOKIE",$str); //过滤COOKIE标签
12. $str=preg_replace("/<(applet.*?)>(.*?)<(/applet.*?)>/si","",$str); //过滤applet标签
13. $str=preg_replace("/<(/?applet.*?)>/si","",$str); //过滤applet标签
14. $str=preg_replace("/<(style.*?)>(.*?)<(/style.*?)>/si","",$str); //过滤style标签
15. $str=preg_replace("/<(/?style.*?)>/si","",$str); //过滤style标签
16. $str=preg_replace("/<(title.*?)>(.*?)<(/title.*?)>/si","",$str); //过滤title标签
17. $str=preg_replace("/<(/?title.*?)>/si","",$str); //过滤title标签
18. $str=preg_replace("/<(object.*?)>(.*?)<(/object.*?)>/si","",$str); //过滤object标签
19. $str=preg_replace("/<(/?objec.*?)>/si","",$str); //过滤object标签
20. $str=preg_replace("/<(noframes.*?)>(.*?)<(/noframes.*?)>/si","",$str); //过滤noframes标签
21. $str=preg_replace("/<(/?noframes.*?)>/si","",$str); //过滤noframes标签
22. $str=preg_replace("/<(i?frame.*?)>(.*?)<(/i?frame.*?)>/si","",$str); //过滤frame标签
23. $str=preg_replace("/<(/?i?frame.*?)>/si","",$str); //过滤frame标签
24. $str=preg_replace("/<(script.*?)>(.*?)<(/script.*?)>/si","",$str); //过滤script标签
25. $str=preg_replace("/<(/?script.*?)>/si","",$str); //过滤script标签
26. $str=preg_replace("/javascript/si","Javascript",$str); //过滤script标签
27. $str=preg_replace("/vbscript/si","Vbscript",$str); //过滤script标签
28. $str=preg_replace("/on([a-z]+)s*=/si","On\1=",$str); //过滤script标签
29. $str=preg_replace("/&#/si","&＃",$str); //过滤script标签

php 正则过滤html 的超链接,代码如下:

1. <?php
2. echo preg_replace("/(?<=href=)([^>]*)(?=>)/i","#", "<a href='www.phpfensi.com'>你好，点这里看看</a><a href='www.phpfensi.com'>你好，点这里看看</a>");
3. ?>

正则:/(?<=href=)([^>]*)(?=>)/

(?<=exp) 匹配exp后面的位置

(?=exp) 匹配exp前面的位置

此正则 匹配 在 href= 之后 “>” 之前 的 非 “>” 的所有字符