How can I merge values of existing rows

Question

I have to get all results and push to HTML table, but existing rows have to be combine to 1 row.

This is my table

id   domain       php_version
-----------------------------
1    localhost    5.5.30
2    live         7.05
3    localhost    5.5.30
4    localhost    5.5.30

and the code which output the html table is:

// Prepare query
$stmt = $mysqli->prepare("SELECT * FROM domains ORDER BY domain ASC LIMIT 10");
// Execute the query
$stmt->execute();
// Bind Parameters
$stmt->bind_result($id, $domain, $php_version);

<?php while ($stmt->fetch()) : ?>
<tr class="row-id-<?php echo $id; ?>">
    <td class="id"><?php echo $id; ?></td>
    <td class="domain"><?php echo $domain; ?></td>
    <td class="php_version"><?php echo $php_version; ?></td>
</tr>
<?php endwhile; ?>

The output looks like this:

And I just want to be like this:

I just want to combine values of dublicated domains in one row/column

Thank you very much!

Answer 1

First get the results out of mysql and into a regular PHP array (called $array in my code), and then this snippet will do what you want:

function sort_by_php_version($a, $b)
{
    if ($a["php_version"] == $b["php_version"]) {
        return 0;
    }
    return ($a["php_version"] < $b["php_version"]) ? -1 : 1;
}

$array = [
["id"=>1, "domain"=>"localhost", "php_version"=>"5.5.30"], 
["id"=>2, "domain"=>"live", "php_version"=>"7.05"], 
["id"=>3, "domain"=>"localhost", "php_version"=>"5.5.30"], 
["id"=>4, "domain"=>"localhost", "php_version"=>"5.5.30"], 
];

usort($array, "sort_by_php_version");

$in_domain = null;
$output_array = array();

for ($i=0; $i<count($array); $i++)
{
    $thisRow = $array[$i];
    $domain = $thisRow["domain"];
    if ($domain == $in_domain) {
        $output_array[count($output_array) - 1]["php_versions"][] = $thisRow["php_version"];
    } else {
        $thisRow["php_versions"] = array($thisRow["php_version"]);
        unset($thisRow["php_version"]);
        $output_array[] = $thisRow;

        $in_domain  = $domain;
    }
}

var_dump($output_array);

Answer 2

I Think that I managed to do it with group_concat:

SELECT domain,
       GROUP_CONCAT(DISTINCT php_version SEPARATOR '\n' ) php_versions,
       ...
FROM domains GROUP BY domain