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. }