PHP domDocument parsing with HTML Table ( PHP Fatal error: Call to a member function getElementsByTagName() on a non-object)

Question

I have an isolated problem with DOMDocument Where the following message appears in the log file:

PHP Fatal error: Call to a member function getElementsByTagName() on a non-object

The isolated problem code looks like this:

$data = "<html><head><title></title></head><body><table id=\"rang-table\"><thead> <tr> <th data-priority=\"2\">Rang</th> <th data-priority=\"1\">Name</th> <th data-priority=\"3\">Punkte</th> </tr> </thead> <tbody> <tr><td>1</td><td>Nadja F.</td><td align=\"right\">-9.44</td></tr><tr><td>2</td><td>Karsten G.</td><td align=\"right\">-2.71</td></tr><tr><td>3</td><td>Bjoern K.</td><td align=\"right\">-1.97</td></tr><tr><td>4</td><td>Stefanie A.</td><td align=\"right\">-0.74</td></tr><tr><td>5</td><td>Christian S.</td><td align=\"right\">1.94</td></tr><tr><td>6</td><td>Rene H.</td><td align=\"right\">2.68</td></tr><tr><td>7</td><td>Boris H.</td><td align=\"right\">10.24</td></tr> </tbody> </table></body></html>";

$dom = new domDocument;

@$dom->loadHTML($data);
$dom->preserveWhiteSpace = false;
$tables = $dom->getElementsByTagName('table');

$rows = $tables->item(1)->getElementsByTagName('tr');

$betreffzeile = "";
foreach ($rows as $row) {
    $cols = $row->getElementsByTagName('td');
    $betreffzeile.=$cols[2];
}  
echo $betreffzeile;

Chris Brendel · Accepted Answer · 2015-04-15 12:43:11Z

2

The array returned by getElementsByTagName is zero-indexed, meaning that in this case, $tables[1] does not exist (you only have one table in the HTML, and that table is referred to as $tables[0]) so you need to change the definition of $rows to this:

$rows = $tables->item(0)->getElementsByTagName('tr');

You also have an error in the loop; you can't refer to a DOMNodelist with an index like you are. You'd need to change the assignment of $betreffzeile to this: $betreffzeile.=$cols->item(2)->nodeValue;

Hope this helps.

answered Apr 15, 2015 at 12:43

Chris Brendel

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Kevin · Accepted Answer · 2015-04-15 12:48:31Z

1

Just to point out the obvious, the indices starts at zero, right now you only have that single table which means it'll fall under 0:

$tables = $dom->getElementsByTagName('table'); // returns DOMNodeList
$rows = $tables->item(0)->getElementsByTagName('tr'); // point to first element index 0

It seems you're trying to get the third <td> values inside the <tbody> why not point to it directly:

$tbody = $dom->getElementsByTagName('tbody');
$rows = $tbody->item(0)->getElementsByTagName('tr');

$betreffzeile = "";
foreach ($rows as $row) {
    $cols = $row->getElementsByTagName('td');
    $betreffzeile .= $cols->item(2)->nodeValue . '<br/>';
}  
echo $betreffzeile;

Sample Output

answered Apr 15, 2015 at 12:48

Kevin

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