Ajutor preluare informatii cu regex

[Dubfx]

Nu stiu de ce domnii admini nu au aprobat mesajul anterior cu rezolvarea, asa ca il mai pun o data:

<?php
$string = '
<ul class="sizeSelect dropdown-menu" id="sUM1970">
                <li data-sku="UM1970/S" class="sizeSelectItem ">

                        <a onclick="setDropdownText(\'UM1970/S\', \'UM1970\'); "><span>Small Chest 35-37&quot;</span> <span class="stockStatusMessage"> </span></a>
                </li>
                <li data-sku="UM1970/M" class="sizeSelectItem ">

                        <a onclick="setDropdownText(\'UM1970/M\', \'UM1970\'); "><span>Medium Chest 38-40&quot;</span> <span class="stockStatusMessage"> Low Stock</span></a>
                </li>
                <li data-sku="UM1970/L" class="sizeSelectItem disabled">

L Sold Out                </li>
                <li data-sku="UM1970/XL" class="sizeSelectItem disabled">

XL Sold Out                </li>
        </ul>
';

preg_match_all("#<\s*?li\b[^>]*>(.*?)</li\b[^>]*>#s", $string, $matches);

$stock = [];
foreach($matches[0] as $li){
    if(!strstr($li, 'disabled')){
        preg_match('/data-sku="(.*?)"/i', $li, $sku);
                preg_match('/"\>\<span\>(.*?) /i', $li, $size);
        $stock[] = ['sku'=>$sku[1], 'size'=>$size[1]];
    }
}
var_dump($stock);