Question

Not sure this is an architecture question or not, please fix if i am wrong,
ok i have a arrays ( by using a foreach )

foreach ($db['products'] as $product) 
{
    echo '<li><a href="">' . $product['tag'] . '</a></li>';
}

 // displays like
 tag1
 tag4
 tag2
 tag2
 tag1
 tag3
 tag1
 tag1
 tag3
 tag2
 tag3
 tag2

do anyone have an idea how to show

//count tags & no duplicate tags ?
tag1(4)
tag2(4)
tag3(3)

like stackoverflow have ?

edit one ( PDO )

$database->fetchall("SELECT pid, uid, name, information, image_tumb, tag, price 
FROM products ORDER BY pid DESC LIMIT 100");

edit two when i do this

$db['products'] = $database->fetchall("SELECT pid, uid, name, information, image_tumb, tag, price 
FROM products GROUP BY tag ORDER BY pid DESC LIMIT 100");

it does work, but some products are not displaying.

• all product is displayed
• but the tags are just like above.

thanks for your time btw, its save my learning time alot.

edit* it work. thanks all

$db['products'] = $database->fetchall("SELECT pid, uid, name, information, image_tumb, price 
FROM products ORDER BY pid DESC LIMIT 100");

$db['tags'] = $database->fetchall("SELECT tag, COUNT(tag) AS counter
FROM products GROUP BY tag ORDER BY tag DESC LIMIT 100");


        foreach ($db['tags'] as $tag) {
            echo '<li><a href="">' . $tag['tag'] . '(' . $tag['counter'] . ')</a></li>';
        }

buy doing this i still get all of my products with a list of tags no duplicate + counter. thanks again!.

Answer 1

You can either use an array to remember the items that already have been displayed:

$items = array();
foreach ($db['products'] as $product) {
    if (!isset($items[$product['tag']]) {
        $items = 1;
    } else {
        $items++;
    }
}
foreach ($items as $tag => $count) {
    echo '<li><a href="">' . $product['tag'] . ' (' . $count . ')</a></li>';
}

Or you sort the array in advance and just compare the current item with the previous one:

array_multisort($db['products'], array_map(function($item) { return $item['tag']; }, $db['products']));
$previous = null;
foreach ($db['products'] as $product) {
    if ($product['tag'] !== $previous['tag']) {
        if ($previous !== null) {
            echo '<li><a href="">' . $product['tag'] . ' (' . $counter . ')</a></li>';
        }
        $counter = 0;
    } else {
        $counter++;
    }
}

But you can probably do the same within your database query and just grab the results like:

SELECT tag, COUNT(tag) AS counter
FROM table
GROUP BY tag
ORDER BY tag