preg_match_all tr/td/th problem

[gilgalbiblewheel]

I want all the trs tds and ths extracted

<?php
$text = '
<table>
<tr>
<th>Unit Type</th>
<th>Availability</th>
<th>Rates</th>
</tr>

<tr>
<td>One Bedroom</td>
<td>Call for Availability</td>
<td>hello</td>
</tr>

<tr>
<td>One Living Room</td>
<td>Call for Availability</td>
<td>hello</td>
</tr>
</table>';
$extract_th="#<th.*>(.+)</th#Ui";
$extract_tr="/<tr>(.*)<\/tr>/isU";
$extract_td="/<td.*>(.*)<\/td>/Ui";
echo $text."<br />\n";
preg_match_all($extract_tr, $text, $match_tr, PREG_SET_ORDER);
//print_r($match_tr[1][1]);
for($i=0; $i<count($match_tr); $i++){
    for($td=0; $td<count($match_tr[$i]); $td++){
        preg_match_all($extract_td, $match_tr[$i][$td], $match_td, PREG_SET_ORDER);
        print_r($match_td[$i]);
    }
}
?>

I'm getting:

Array
(
    [0] => <td>Call for Availability</td>
    [1] => Call for Availability
)
Array
(
    [0] => <td>Call for Availability</td>
    [1] => Call for Availability
)
Array
(
    [0] => <td>hello</td>
    [1] => hello
)
Array
(
    [0] => <td>hello</td>

    [1] => hello
)