[英]how to select unique keywords from a comma separated tags
I want to retrieve some tags from my database, they are in the form: 我想从我的数据库中检索一些标签,它们的形式如下:
topic_id tags
1 `tag1,tag2,tag3`
2 `tag1,tag4,tag5`
3 `tag2,tag4,tag5`
4 `tag6,tag7,tag2`
I want to have something like this: 我想要这样的东西:
tag1 tag2 tag3 tag4 tag5 tag6 tag7
ie all unique tags 即所有独特的标签
So that I can wrap each tag in a link in order to group news articles that has such specific tags. 因此,我可以将每个标记包装在一个链接中,以便对具有此类特定标记的新闻文章进行分组。
This following query I've written so far is not working: 我到目前为止写的以下查询无法正常工作:
$tags = mysql_query("SELECT tags, topic_id
FROM forum_topics
WHERE topic_id > 0") or die (mysql_error());
while($tag = mysql_fetch_assoc($tags)){
$split_tags = "$tag";
$pieces = explode(",", $split_tags);
echo $pieces ;
When I did print_r($pieces);
当我做
print_r($pieces);
I got Array ( [0] => Array ) Array ( [0] => Array ) Array ( [0] => Array ) Array ( [0] => Array )
我得到了
Array ( [0] => Array ) Array ( [0] => Array ) Array ( [0] => Array ) Array ( [0] => Array )
Which was not what I was looking for. 这不是我想要的。
As it is now my table structure looks like this topic_id , topic_head, topic_body, topic_tag, topic_date, topic_owner
.. How can I further make the topic_tag normal. 因为现在我的表结构看起来像
topic_id , topic_head, topic_body, topic_tag, topic_date, topic_owner
..如何进一步使topic_tag正常。
If you normalize your database design, then you could get all the distinct tags very easy by 如果您规范化数据库设计,那么您可以非常轻松地获得所有不同的标签
SELECT DISTINCT tags FROM forum_topics WHERE topic_id > 0
But now, with your database structure, you can't do this, you have to get all the tags and use array_unique
on them. 但是现在,使用您的数据库结构,您无法执行此操作,您必须获取所有标记并对其使用
array_unique
。
$tags = array();
$rows = mysql_query("SELECT tags FROM forum_topics WHERE topic_id > 0") or die (mysql_error());
while($row = mysql_fetch_assoc($rows)){
$tags = array_merge($tags, explode(',' $row['tags']));
}
$tags = array_unique($tags);
print_r($tags);
But even you could do this, normalize your database design is the best choice. 但即使你可以做到这一点,规范化你的数据库设计是最好的选择。
Try this: 试试这个:
$tags = "";
while($row = mysql_fetch_assoc($tags)) {
$tags .= $row["tags"] . ",";
}
$tags = rtrim($tags, ",");
$pieces = explode(",", $tags);
print_r($pieces); // all of them
$pieces = array_unique($pieces);
print_r($pieces); // distinct
...and as Jonah Bishop already mentioned , please avoid mysql_*
functions. ......正如Jonah Bishop已经提到的那样 ,请避免使用
mysql_*
函数。
select distinct tags from forum_topics;
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.