Php “在哪里输入”&；nbsp"；在下面的代码中？

有人能帮我在echo语句的每一行之间找到一个添加位置吗。在哪里以及如何在每行之间添加空格？请忽略已注释掉的第一组echo语句。谢谢你

<link rel="stylesheet" href="docfullcss.css">

<?php
    $dbhost = 'localhost';
    $dbuser = 'root';
    $dbpass = '';
    $dbname = 'employee_info';

    $conn = mysqli_connect($dbhost, $dbuser, $dbpass, $dbname);

    if(! $conn ) {
        die('Could not connect: ' . mysqli_connect_error());
    } 

    $sql = 'SELECT * FROM `docfull` ORDER BY `COL 7` ASC';    
    $retval = mysqli_query($conn,$sql);

    if(! $retval ) {
        die('Could not get data: ' . mysqli_error($conn));
    }

    while($row = mysqli_fetch_array($retval, MYSQLI_ASSOC)) {
        /*    (ignore this commented section)
              echo "<table>";
              echo "<tr>";
              echo "<td>COL 1</td>";
              echo "<td>COL 2</td>";
              echo "</tr>";
              echo "</table>";
        */    
        echo "<tr><td>" . $row['COL 1'] . "</td>
                  <td>" . $row['COL 2'] . "</td>
                  </tr>" . $row['COL 3'] . "</td>
                  <td>" . $row['COL 4'] . "</td>
                  <td>" . $row['COL 5'] . "</td>
                  <td>" . $row['COL 6'] . "</td>
                  <td>" . $row['COL 7'] . "</td>
                  <td>" . $row['COL 8'] . "</td>
                  <td>" . $row['COL 9'] . "</td>
                  <td>" . $row['COL 10'] . "</td>
                  <td>" . $row['COL 11'] . "</td>
                  <td>" . $row['COL 12'] . "</td>
                  <td>" . $row['COL 13'] . "</td>
                  <td>" . $row['COL 14'] . "</td>
                  <td>" . $row['COL 15'] . "</td>
                  <td>" . $row['COL 16'] . "</td><td>";
        echo "<br><br>";         
    }  

    mysqli_close($conn); 
?>

问题就在这里

echo "<tr><td>" . $row['COL 1'] . "</td><td>" . $row['COL 2'] .     
"</td></tr>" . $row['COL 3'] .

---

在TR之间不需要NBSP，它们自动调整自己。在关闭表后，如何添加表行？使用TR和TdAdple副本之间的自动间隔应该考虑使用模板引擎来避免这样混乱的代码…

echo '<table>';
while($row = mysqli_fetch_array($retval, MYSQLI_ASSOC)) {        
    echo "<tr><td>" . $row['COL 1'] . "</td>
              <td>" . $row['COL 2'] . "</td>
              <td>" . $row['COL 3'] . "</td>
              <td>" . $row['COL 4'] . "</td>
              <td>" . $row['COL 5'] . "</td>
              <td>" . $row['COL 6'] . "</td>
              <td>" . $row['COL 7'] . "</td>
              <td>" . $row['COL 8'] . "</td>
              <td>" . $row['COL 9'] . "</td>
              <td>" . $row['COL 10'] . "</td>
              <td>" . $row['COL 11'] . "</td>
              <td>" . $row['COL 12'] . "</td>
              <td>" . $row['COL 13'] . "</td>
              <td>" . $row['COL 14'] . "</td>
              <td>" . $row['COL 15'] . "</td>
              <td>" . $row['COL 16'] . "</td></tr>";
}  
echo '</table>';