在php中连接html标签的字符串

Question

I want to build table by concatenating string like this
code :

 $html = '';
 $html .="<tr>
            <td>test</td>
            <td>test</td>    
        </tr>";
 $html .="<tr>
            <td>test</td>
            <td>test</td>    
        </tr>";

But I'm getting this as output :

test test 
test test

Instead of table. What did I miss?

EDIT: Forgot to mention that I'm doing this inside of <table> tags

<table>
<tr><td>Col 1</td> <td>Col 2</td> </tr>

  <?
    //concat code
  ?>
</table>

HTML output structure:

output

Answer 1

You missed to add <table> tag at start and </table> in end of your html.
Do like this

  $html = '<table>';
  $html .="<tr>
            <td>test</td>
            <td>test</td>    
        </tr>";
  $html .="<tr>
            <td>test</td>
            <td>test</td>    
        </tr>";
  $html .= '</table>';

Answer 2

You forgot to mention border attribute inside table open tag, try below example in order to see table structure in browser.

$html = '<table border="1">';
$html .="<tr>
            <td>test</td>
            <td>test</td>    
        </tr>";
$html .="<tr>
            <td>test</td>
            <td>test</td>    
        </tr>";
$html .= '</table>';