Preg split table all tds

Question

Using the DOMDocument class, you can easily get all cells like so:

$dom = new DOMDocument;
$dom->loadHTML($htmlString);
$cells = $dom->getElementsByTagName('td');
$contents = array();
foreach($cells as $cell)
{
    $contents[] = $cell->nodeValue;
}
var_dump($contents);

The $cells var is a DOMNodeList, so it has some methods that you might be able to use. The $cell variable will be assigned a particular instance of DOMNode on each iteration, which has all sorts of methods/properties that could be useful for your use-case, too (like getAttribute)
Looking at your question, though, you'll be wanting the outer html (including the tags) in your array. Now that's easy:"

$markup = array();
foreach($cells as $cell)
{
    $markup[] = $dom->saveXML($cell);
}

Side-note:
Perhaps a for loop will be more performant than foreach. I haven't tested/compared the two, but you could try if you see a difference the approach above and this one:

$markup = array();
for($i=0, $j = $cells->length;$i<$j;$i++)
{
    $markup[] = $dom->saveXML($cells->item($i));
}

The reason why I'm using saveXML and not saveHTML is simple: saveHTML will generate a valid DOM (including opening <html> tags and what have you). Not what you want. That's why saveXML is, in this case, the better choice.
A slightly related question of mine here