Untitled

<?php

function getAllHrefs($html) {
    $doc = new \DOMDocument();
    $doc->loadHTML($html);

    $anchors = $doc->getElementsByTagName("a");
    $hrefs = [];
    foreach ($anchors as $a) {
        $hrefs[] = $a->getAttribute("href");
    }
    return $hrefs;
}

$html = '
<a href=https://svetavto.com.ua/catalog.php?idg=21  >
<a href="/stati/">
<a class="rassol2" href="http://svetavto.com.ua/stati/">
';

print_r(getAllHrefs($html));