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How to Combine text and query result as value of a PHP variable

I have a variable ($html) which has some value assigned to it (Later I need to save it as PDF with MPDF). A part of it’s value is generated by making query to database.
Right now the code looks like…

$html = '
<html>
    <head>...</head>

    <body>
        <table>
        <thead>
        <tr>
           <td>ITEM NAME</td>
           <td>QTY</td>
           <td>PRICE</td>
           <td>TOTAL</td>
        </tr>
        </thead>

        <tbody>'.

        $items_query = "SELECT * FROM cart WHERE u_id='$u_id'"
        or die('Error Querying Database...');

        $run_items_query = mysqli_query($con, $items_query);

        while($row_query = mysqli_fetch_array($run_items_query)){

            $item = $row_query['p_name'];
            $unit_price = $row_query['price'];
            $qty = $row_query['qty'];
            $price = $unit_price*$qty;

            echo'
                <tr>
                    <td>'.$item.'</td>
                    <td>'.$qty.'</td>
                    <td>'.$unit_price.'</td>
                    <td>'.$price.'</td>
                </tr>
            ';
        }

        '<tr>
           <td>TOTAL:</td>
           <td>0000</td>
        </tr>
        </tbody>
        </table>
    </body>
</html>';

What I am doing here is – Creating simple table and adding all the <td> via SQL Query. I can’t get how to concatenate simple text part and query result part as value to the $html variable.
Right now it shows only the first part of the value before query start and then shows this – ‘SELECT * FROM cart WHERE u_id=’ee0fivtt9tq39i5mpdhtf9v051’ … not the <td> that it gets.
Please let me know if you can figure out what I am doing wrong…

Source: Stackoverflow

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