illegal string offset error in portfolio

Question

I am passing an associative array(positions) via render:

 render("portfolio.php", [ "title" => "Portfolio","positions" => $positions]);

and trying to print it in portfolio using below code:

 foreach ($positions as $position)
    {
        print("<tr>");
        print("<td>{$position["name"]}</td>");
        print("<td>{$position["symbol"]}</td>");
        print("<td>{$position["shares"]}</td>");
        print("<td>{$position["price"]}</td>");
        print("</tr>");
    }

but it gives me a whole list of errors: Here is a part of my index function:

 $positions = [];
    $balance = 10000.0000;

    // query info from portfolios
    $rows = CS50::query("SELECT * FROM portfolios WHERE user_id = ?", $_SESSION["id"]);

    // enter portfolio details in the array 'positions'
    foreach ($rows as $row)
    {
        $stock = lookup($row["symbol"]);
        if ($stock !== false)
        {
            $positions[] = [
                "name" => $stock["name"],
                "price" => $stock["price"],
                "shares" => $row["shares"],
                "symbol" => $row["symbol"]
            ];

            $positions[] = ["price" => number_format($positions["price"],2,'.',',')];
        }

        else 
        {
            apologize("This is no stock in your portfolio");
        }
    }

    $positions[] = ["balance" => $balance];
    $positions[] = ["balance" => number_format($positions["balance"],2,'.',',')];

    // render portfolio
    render("portfolio.php", [ "title" => "Portfolio","positions" => $positions]);

I really can't find the error. What can be done ?? here's what var_dump outputs:

Answer 1

Each time you do this $positions[] = ["price" =>number_format($positions["price"],2,'.',',')]; there is a row added to the $positions array that does not have "name", "shares" or "symbol". Ditto these (plus no "price"):

$positions[] = ["balance" => $balance];
$positions[] = ["balance" => number_format($positions["balance"],2,'.',',')];

Perhaps add a var_dump($positions) before the foreach to see what $positions really looks like.