<?php
$html = '<div itemprop="description" property="v:description">
<span class="gray">Вид:</span>
Черный
<br>
<span class="gray">Вид заварки:</span>
В пакетиках
<br>
<span class="gray">Вес:</span>
20*1.5г
<br>
<span class="gray">Страна:</span>
Россия
<br>
</div>';
$dom = new DomDocument;
$dom->loadHTML('<?xml encoding="utf-8" ?>' . $html);
$xpath = new DomXPath($dom);
$spans = $xpath->query("//span[contains(@class, 'gray')]");
$arr = [];
foreach($spans as $span){
$arr[$span->nodeValue] = trim($span->nextSibling->nodeValue); }
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