php正则获取关键字、标题、网页描述代码

本文章来给大家介绍关于php正则获取关键字、标题、网页描述代码,有需要了解的同学可进入参考.

获取关键字,代码如下:

1. function get_keywords($html) 
2. { 
3. $html=strtolower($html); 
4. preg_match("@<head[^>]*>(.*?)</head>@si",$html, $regs);  
5. $headdata = $regs[1]; 
6. preg_match("/<meta +name *=["']?keywords["']? *content=["']?([^<>"]+)["']?/i", $headdata, $res); 
7. if (isset ($res)) { 
8. $keywords = $res[1]; 
9. } 
10. if ($keywords == "") $keywords = "无"; 
11. $keywords=replace_word(textcut($keywords,250)); 
12. $keywords=str_replace("-",",",$keywords); 
13. $keywords=str_replace("，",",",$keywords); 
14. $keywords=str_replace(" ",",",$keywords); 
15. $keywords=str_replace("|",",",$keywords); 
16. $keywords=str_replace("、",",",$keywords); 
17. $keywords=str_replace(",,",",",$keywords); 
18. $keywords=str_replace("<","",$keywords); 
19. $keywords=str_replace(">","",$keywords); 
20. return addslashes(trim($keywords)); 
21. } 

获取标题,代码如下:

1. function get_title($html) 
2. { 
3.   $html=strtolower($html); 
4.  $title = str_replace(" - ",",",cut($html,"<title>", "</title>" )); 
5. //if ($title == "") $title = "无标题"; 
6. if ($title) $title=replace_word(textcut($title,80)); 
7. if ($title) $title=preg_replace("/<(.*?)>/","",$title); 
8. return addslashes(trim($title)); 
9. } 

获取网页描述description,代码如下:

1. function get_description($html) 
2. { 
3. $html=strtolower($html); 
4. preg_match("@<head[^>]*>(.*?)</head>@si",$html, $regs);  
5. $headdata = $regs[1]; 
6. preg_match("/<meta +name *=["']?description["']? *content=["']?([^<>"]+)["']?/i", $headdata, $res); 
7.       if (isset ($res)) { 
8.        $description = $res[1]; 
9.       } 
10. if ($description == "") $description = "无"; 
11. $description=replace_word(textcut($description,250)); 
12. $description=str_replace("-",",",$description); 
13. $description=str_replace("，",",",$description); 
14. $description=str_replace(" ",",",$description); 
15. $description=str_replace("|",",",$description); 
16. $description=str_replace("、",",",$description); 
17. $description=str_replace(",,",",",$description); 
18. $description=str_replace("<","",$description); 
19. $description=str_replace(">","",$description); 
20. return addslashes(trim($description)); 
21. }