strip_tags函數

strip_tags --- 去除字串中的HTML和PHP標簽

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

例,代碼如下:

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. ?> 

正則過濾各種標簽,空格,換行符,代碼如下:

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

php 正則過濾html 的超鏈接,代碼如下:

1. <?php  
2. echo preg_replace("/(?<=href=)([^>]*)(?=>)/i","#", "<a href='www.49028c.com'>你好，點這里看看</a><a href='www.49028c.com'>你好，點這里看看</a>");  
3. ?> 

正則:/(?<=href=)([^>]*)(?=>)/ 

(?<=exp) 匹配exp后面的位置 

(?=exp) 匹配exp前面的位置 

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