打印产品属性及其值

Question

How do I print the attributes and values together by placing each value under the attribute it belongs. So one attribute and several values under.

//i can have the array the normal way if it helps, like [0] => Red...
[attribute] => Array
    (
        [0] => Array
            (
                [Colour] => Red
            )

        [1] => Array
            (
                [Colour] => Blue
            )

        [2] => Array
            (
                [Colour] => Green
            )

        [3] => Array
            (
                [Size] => Small
            )

        [4] => Array
            (
                [Size] => Medium
            )

        [5] => Array
            (
                [Size] => Large
            )

    )

If this can be done in the query by returning one attribute instead of multiple attributes and the values that go with it, that's great. But I'd also like to see this done by printing the array key once and then the values, I will +1 it.

SELECT `attribute`, `value` 
FROM (`attribute_value`) 
JOIN `product_attr_value` ON `product_attr_value`.`attribute_value_id` = `attribute_value`.`id`  
JOIN `products` ON `products`.`id` = `product_attr_value`.`product_id` 
WHERE `products`.`item_name` LIKE '%qwe2%'

EDIT:

file1

for ($set = array (); $row = $result->fetch_assoc(); $set[] = $row);

return $set;

file2

foreach ($attr_value as $val)
{
echo $val['attribute'] ."<br>";

$values = $val['group_concat(`value`)'];
$value = explode(",", $values);
echo $value."<br>";
}

Answer 1

You want a group by :

SELECT attribute, group_concat(`value`)
FROM attribute_value av JOIN
     product_attr_value pav
     ON pav.attribute_value_id = av.id JOIN
     products p
     ON p.id = pav.product_id
WHERE p.`item_name` LIKE '%qwe2%'
group by attribute;

I also added table aliases to avoid repeating the long table names throughout the query.

group_concat() will concatenate the values into a single string. By default, these are separated by a comma. You can control that with the SEPARATOR keyword.