phparrayspdoassociative

PDO how to get key-value pairs from fetchAll()?


I have this code:

$dbInstance = DB_Instance::getDBO();
$statement = $dbInstance->prepare("SELECT id, name FROM language ORDER BY id");
$statement->execute();      
$rows = $statement->fetchAll(); 

//Create associative array wuth id set as an index in array
$languages = array();
foreach($rows as $r) {
    $languages[$r['id']] = $r['name'];
}
return $languages;

I can't figure out how to use PDO-statement to achieve the same result that array $languages produces. I've tried some different fetch_styles.

I've tried some different styles and I could get like:

[0] svenska
[1] engelska

but I want like:

[1] svenska
[2] engelska

(where 1 and 2 are the values of id in database)

I guess I could create a function and call that with FETCH_FUNC but I'm not sure that would be so great either.

Is the above the best/cleanest way to do it?


Solution

  • Not really sure if there's any better way. You could try this?

    $rows = $statement->fetchAll(PDO::FETCH_ASSOC);
    
    $languages = array();
    
    function getLangs($col, $row) {
         $languages[$col['id']] = $col['name'];
    }
    
    array_walk($rows, 'getLangs');
    

    There's nothing wrong with foreach loops. I'd actually use what you've got. It's hard to get cleaner than that...

    UPDATE:

    After carefully re-reading your question, what you REALLY should be asking is whether you can format your QUERY in such a way that the results are returned in a different format.

    The way that your normal SELECT query is returned is thusly:

    +----+----------+
    | id |     name |
    +----+----------+
    |  1 |  svenska |
    |  2 | engelska |
    | .. |      ... |
    | .. |      ... |
    +----+----------+
    
    $row = array(
        row_1 => array(
            id   => "1",
            name => "svenska"
        ),
        row_2 => array(
            id   => "2",
            name => "engelska"
        ),
        row_3 => array(
            id   => "...",
            name => "..."
        ),
        row_4 => array(
            id   => "...",
            name => "..."
        )
    )
    
    $row[$row_number][$column_name] = $value
    

    What you're asking for is for some way to return your query results like THIS:

    // Query result is only one row, with each 'id' as column name
    // And the 'name' from the same row as it's value...
    
    +---------+----------+-----+-----+-----+
    |       1 |        2 | ... | ... | ... |
    +---------+----------+-----+-----+-----+
    | svenska | engelska | ... | ... | ... |
    +---------+----------+-----+-----+-----+
    
    $row = array(
        row_1 => array(
              1 => "svenska",
              2 => "engelska",
            ... => "...",
            ... => "...",
            ... => "..."
        )
    )
    
    $languages = $row[row_1];
    $languages[$id] = $name;
    

    I'm not entirely sure you CAN do this in SQL, to be perfectly honest. I would also recommend against it, even if you could. It would be horrendous for a scaling table. If your table is static, then why not format it in the way I just mentioned to begin with? Why not just have it in a static PHP array in an include file?