blocks|key|638616|text|$data+=+query_data();
$cat+=+array();
foreach($data+as+$item)
{
++++$cat[$item['category']][]+=+$item['sub_category'];
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|638617|现在，$cat就是您需要的。|unstyled|offset|length|style|CODE|638618|entityMap^0|0|3|4|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>$data = query_data();
$cat = array();
foreach($data as $item)
{
 $cat[$item['category']][] = $item['sub_category'];
}
</code></pre>

Now, <code>$cat</code> is what you need.

blocks|key|2953718|text|你可以给它们指定类别id，例如，假设手机的id为1，那么其中的所有项目的subcategory_id也将为1。类似地，如果打印机的id为2，则其下的所有subcategory_id的id也将为2。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2953719|现在您可以运行简单的查询来检索特定于字段的类别。像这样：|2953720|SELECT+*+from+table_name+WHERE+subcategory_id+=+1;|code-block|syntax|javascript|2953721|这将给出cellphones...similarly中的所有类别，您可以对所有字段执行此操作...|2953722|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can give category id to them for example, say cellphones has an id of 1 then all items inside this will also have a subcategory_id of 1. Similarly if the printers have id of 2 then all subcategory_id under it will have id as 2.

Now you can run simple query to retrieve the field specific category. like:

<pre><code>SELECT * from table_name WHERE subcategory_id = 1;
</code></pre>

This will give out all the categories inside cellphones...similarly you can do for all fields...

blocks|key|2953757|text|这应该行得通-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2953758|$categories+=+Array();
//Assuming+database+handle+is+$db
$r1+=+$db->query("select+distinct(Category)+from+table_name")+or+die("err+in+q1");
while($cat_arr+=+$r1->fetch_assoc()){
++++$cat+=+$cat_arr['Category'];
++++$sub_cats+=+Array();
++++$db->query("select+Sub-Category+from+table_name+where+Category+=+$cat")+or+die("err+in+q2");
++++while($sub_arr+=+$r2->fetch_assoc()){
++++++++array_push($sub_cats,$sub_arr['Sub-Category']);
++++}
++++$categories[$cat]+=+$sub_cats;
}|code-block|syntax|javascript|2953759|$categories数组现在具有表的详细信息，并且可以按原样使用。|2953760|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This should work -

<pre><code>$categories = Array();
//Assuming database handle is $db
$r1 = $db-&gt;query("select distinct(Category) from table_name") or die("err in q1");
while($cat_arr = $r1-&gt;fetch_assoc()){
 $cat = $cat_arr['Category'];
 $sub_cats = Array();
 $db-&gt;query("select Sub-Category from table_name where Category = $cat") or die("err in q2");
 while($sub_arr = $r2-&gt;fetch_assoc()){
 array_push($sub_cats,$sub_arr['Sub-Category']);
 }
 $categories[$cat] = $sub_cats;
}
</code></pre>

The $categories array now has the details of the table, and can be used as is.

I have a table that looks like this:

<pre><code>+----------------------------------+
| Category | Sub-Category |
+---------------+------------------+
| Cell Phones | Smart Phones |
| Cell Phones | Tablet Phones |
| Cell Phones | Other Phones |
| Computers | Desktops |
| Computers | Laptops |
| Computers | Chromebooks |
+---------------+------------------+ etc..
</code></pre>

And I would like to display this data on my website using PHP, like this:

<img src="https://i.stack.imgur.com/WUG4z.png" alt="desired layout">

How would I display the information as above(one category, all subcategories under) using PHP? Also how can I evenly divide the list of category/subcategories into 3 columns? 

I've found tutorials but none seemed to use PHP, which is the part I'm having trouble with.

Thank you guys for your time.

Display MySQL Data in PHP with Categories

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个表，看起来像这样：+----------------------------------+|    Category   |    Sub-Category  |+---------------+------------------+|  Cell Phones  |   Smart Phones   ||  ...

问在PHP中显示带类别的MySQL数据
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