PHP resorting tr's in a table by class - php

Question

I have a pretty large table which I put on the page with a php call
<?php include('7c2dsf12c24-4441e-532ded8-88dsc7-4fsd2c8.txt'); ?>
That file has thousands of TR's and TD's within.
The text file is dynamically created and updated every couple of hours.
Some of the rows have a "featuredRow" class on them, which helps with styling.
However, they appear in a random order in that text file.
I need to sort them so that the featured rows go first. Basically take all the rows, and put all the featuredRows at the top of the table, followed by all the other rows.
I already have javascript code that sorts the table by different td's alphabetically, but since its a front-end sorting, and the table consists of thousands of tr's (the text file is 7mb of text), it is quite a strain on Internet Explorer, if I was to filter it initially (the user expects to wait a long time when reordering the entire table alhpabetically, but he is not expected to wait 30 seconds until everything is ordered right (only 2-3 seconds on chrome is 20-30 seconds on IE)).
Therefore I figured that doing it on the backend, and displaying a reordered text file right away would be better, instead of using the dom, to create huge arrays and lag out the user's browser.
TL/DR
As an example, the file's structure looks like something like this:
<tr><td></td><td></td></tr>
<tr class="featuredRow"><td></td><td></td></tr>
<tr><td></td><td></td></tr>
<tr><td></td><td></td></tr>
<tr class="featuredRow"><td></td><td></td></tr>
<tr class="featuredRow"><td></td><td></td></tr>
<tr><td></td><td></td></tr>
<tr class="featuredRow"><td></td><td></td></tr>
<tr><td></td><td></td></tr>
I need to take that file and reorder the structure to this:
<tr class="featuredRow"><td></td><td></td></tr>
<tr class="featuredRow"><td></td><td></td></tr>
<tr class="featuredRow"><td></td><td></td></tr>
<tr class="featuredRow"><td></td><td></td></tr>
<tr><td></td><td></td></tr>
<tr><td></td><td></td></tr>
<tr><td></td><td></td></tr>
<tr><td></td><td></td></tr>
<tr><td></td><td></td></tr>
And I do not want to use JS since there are thousands of rows, megabytes of data, and it will take a long time on IE to do it on the front-end.
What is the easiest way to make it work in PHP?
Thank you
P.S.
Here is how the html/php looks like now - jsfiddle.net/1pggwuah
Here is another link on how two trs of the text file look like (there are about 3,000-4,000 of those trs in the text file) jsfiddle.net/a308w8b6

Answer 1

$rows = file_get_contents('/path/to/rows.html');
$rows = explode('<tr', $rows);
sort($rows);
$rows = implode('<tr', $rows);
Demo: https://ideone.com/bITopF

Answer 2

$domd=#DOMDocument::loadHTMLFile('7c2dsf12c24-4441e-532ded8-88dsc7-4fsd2c8.txt');
$masterele=$domd->getElementsByTagName("table")->item(0);
foreach($domd->getElementsByTagName("tr") as $trele){
if($trele->getAttribute("class")!=="featuredRow"){continue;}
$trele->parentNode->removeChild($trele);
$masterele->insertBefore($trele,$masterele->firstChild);
}
echo $domd->saveHTML();
EDIT: the original code would put "featuredRow"'s at the bottom, not the top, sorry, fixed it now (use insertBefore instead of append)