PHP string search and replace - possible use of DOM Needed - php

Question

I cant seem to figure out how to achieve my goal.
I want to find and replace a specific class link based off of a generated RSS feed (need the option to replace later no matter what link is there)
Example HTML:
<a class="epclean1" href="#">
WHAT IT SHOULD LOOK LIKE:
<a class="epclean1" href="google.com">
May need to incorporate get element using DOM as the Full php has a created document. If that is the case I would need to know how to find by class and add the href url that way.
FULL PHP:
<?php
$rss = new DOMDocument();
$feed = array();
$urlArray = array(array('url' => 'https://feeds.megaphone.fm')
);
foreach ($urlArray as $url) {
$rss->load($url['url']);
foreach ($rss->getElementsByTagName('item') as $node) {
$item = array (
'title' => $node->getElementsByTagName('title')->item(0)->nodeValue
);
array_push($feed, $item);
}
}
usort( $feed, function ( $a, $b ) {
return strcmp($a['title'], $b['title']);
});
$limit = sizeof($feed);
$previous = null;
$count_firstletters = 0;
for ($x = 0; $x < $limit; $x++) {
$firstLetter = substr($feed[$x]['title'], 0, 1); // Getting the first letter from the Title you're going to print
if($previous !== $firstLetter) { // If the first letter is different from the previous one then output the letter and start the UL
if($count_firstletters != 0) {
echo '</ul>'; // Closing the previously open UL only if it's not the first time
echo '</div>';
}
echo '<button class="glanvillecleancollapsible">'.$firstLetter.'</button>';
echo '<div class="glanvillecleancontent">';
echo '<ul style="list-style-type: none">';
$previous = $firstLetter;
$count_firstletters ++;
}
$title = str_replace(' & ', ' & ', $feed[$x]['title']);
echo '<li>';
echo '<a class="epclean'.$i++.'" href="#" target="_blank">'.$title.'</a>';
echo '</li>';
}
echo '</ul>'; // Close the last UL
echo '</div>';
?>
</div>
</div>
The above fullphp shows on site like so (this is shortened as there is 200+):
<div class="modal-glanvillecleancontent">
<span class="glanvillecleanclose">×</span>
<p id="glanvillecleaninstruct">Select the first letter of the episode that you wish to get clean version for:</p>
<br>
<button class="glanvillecleancollapsible">8</button>
<div class="glanvillecleancontent">
<ul style="list-style-type: none">
<li><a class="epclean1" href="#" target="_blank">80's Video Vixen Tawny Kitaen 044</a></li>
</ul>
</div>
<button class="glanvillecleancollapsible">A</button>
<div class="glanvillecleancontent">
<ul style="list-style-type: none">
<li><a class="epclean2" href="#" target="_blank">Abby Stern</a></li>
<li><a class="epclean3" href="#" target="_blank">Actor Nick Hounslow 104</a></li>
<li><a class="epclean4" href="#" target="_blank">Adam Carolla</a></li>
<li><a class="epclean5" href="#" target="_blank">Adrienne Janic</a></li>
</ul>
</div>

Answer 1

You're not very clear about how your question relates to the code shown, but I don't see any attempt to replace the attribute within the DOM code. You'd want to look at XPath to find the desired elements:
function change_clean($content) {
$dom = new DomDocument;
$dom->loadXML($content);
$xpath = new DomXpath($dom);
$nodes = $xpath->query("//a[#class='epclean1']");
foreach ($nodes as $node) {
if ($node->getAttribute("href") === "#") {
$node->setAttribute("href", "https://google.com/");
}
}
return $dom->saveXML();
}
$xml = '<?xml version="1.0"?><foo><bar><a class="epclean1" href="#">test1</a></bar><bar><a class="epclean1" href="https://example.com">test2</a></bar></foo>';
echo change_clean($xml);
Output:
<foo><bar><a class="epclean1" href="https://google.com/">test1</a></bar><bar><a class="epclean1" href="https://example.com">test2</a></bar></foo>

Answer 2

Hmm. I think your pattern and replacement might be your problem.
What you have
$pattern = 'class="epclean1 href="(.*?)"';
$replacement = 'class="epclean1 href="google.com"';
Fix
$pattern = '/class="epclean1" href=".*"/';
$replacement = 'class="epclean1" href="google.com"';