WordPress - Cut figure galleries from Gutenberg content

<?php
$gallery_loop = false;
$the_content = get_the_content(); // all content
$galleries = []; //Create empty figures array that will hold all of our parsed HTML data

while ($gallery_loop) {
	$gallery = $the_content; // <figure .. </figure>

	//<!-- wp:gallery {"ids":[742,739,737],"linkTo":"none"} -->
	$cut_from = '<!-- wp:gallery';
	$cut_to = '<!-- /wp:gallery -->';

	//$cut_from = '<ul class="blocks-gallery-grid';
	//$cut_to = '</ul>';

	$pos1 = strpos($gallery, $cut_from);
	$pos2 = strpos($gallery, $cut_to, $pos1);
	if ($pos2) {
		$gallery = substr($gallery, $pos1, ($pos2 - $pos1 + strlen($cut_to)));
		$the_content = str_replace($gallery, '[gallery]'.$pos1.'-'.$pos2.'[/gallery]', $the_content);
		//exit(htmlentities($gallery));

		//Create a new DOM document
		$dom = new DOMDocument;

		//Parse the HTML.
		@$dom->loadHTML($gallery);
//dd($gallery);
		//Create new XP
		$xp = new DOMXpath($dom);
		//$_xp = $dom->getElementsByTagName('ul')->item(0);
//dd($_xp);
//dd($xp);
		//Get all <figure> elements
		$figureElements = $xp->query('/html/body/figure/ul//figure');
//dd($figureElements);
		//Create number variable to keep track of our $galleries array index
		$figureCount = 0;

		//Loop through each <figure> element
		foreach ($figureElements as $figureElement) {
			if (! $figureElement) {
				continue;
			}

			//$galleries[$pos1.'-'.$pos2][$figureCount]["class"] = trim($figureElement->getAttribute('class'));
			//$galleries[$pos1.'-'.$pos2][$figureCount]["src"] = trim($figureElement->getAttribute('src'));
			//$galleries[$pos1.'-'.$pos2][$figureCount]["alt"] = trim($figureElement->getAttribute('alt'));
			$galleries[$pos1.'-'.$pos2][$figureCount]["src"] = $xp->query('//img', $figureElement)->item($figureCount)->getAttribute('src');
			$galleries[$pos1.'-'.$pos2][$figureCount]["alt"] = $xp->query('//img', $figureElement)->item($figureCount)->getAttribute('alt');

			//Check that an img class exists, otherwise set the value to null. If we don't do this PHP will throw a NOTICE.
			/*if (boolval($xp->evaluate('//img', $figureElement)->item($figureCount))) {
				$galleries[$pos1.'-'.$pos2][$figureCount]["img"]["class"] = $xp->query('//img', $figureElement)->item($figureCount)->getAttribute('class');
			} else {
				$galleries[$pos1.'-'.$pos2][$figureCount]["img"]["class"] = null;
			}*/

			//Check that a <figcaption> element exists, otherwise set the value to null
			if (boolval($xp->evaluate('//figcaption', $figureElement)->item($figureCount))) {
				$galleries[$pos1.'-'.$pos2][$figureCount]["class"] = $xp->query('//figcaption', $figureElement)->item($figureCount)->nodeValue;
			} else {
				$galleries[$pos1.'-'.$pos2][$figureCount]["class"] = null;
			}

			//Increment our $figureCount so that we know we can create a new array index.
			$figureCount++;
		}
	} else {
		$gallery_loop = false;
		break;
	}
}

//dd($the_content);

if ($galleries) {
	foreach ($galleries as $gallery_key => $figures) {
		$gallery_html = '';
		$gallery_html .= '<div class="owl-carousel mad-owl-center-2 mad-grid mad-owl-moving nav-size-2 no-dots">';
		foreach ($figures as $figure) {
			$gallery_html .= '<div class="mad-owl-item">';
			$gallery_html .= '<a href="'.$figure['src'].'" data-gallery="page-'.$gallery_key.'" title="'.$figure['alt'].'">';

			ob_start();
			\App\thumber($figure['src'], 645, 373, $figure['class'], $figure['alt'], $figure['alt']);
			$htmlStr = ob_get_contents();
			$gallery_html .= $htmlStr;
			ob_end_clean();

			$gallery_html .= '</a>';
			$gallery_html .= '</div>';
		}
		$gallery_html .= '</div>';

		$the_content = str_replace('[gallery]'.$gallery_key.'[/gallery]', $gallery_html, $the_content);
	}

	//dump(($the_content));
	  //  dd();
}
?>



<?php 
<div class="slick-carousel">
<?php foreach ($galleries as $_figures): ?>
	<?php foreach ($_figures as $figure): ?>
		<div class="mad-owl-item">
			<a href="{{ $figure['src'] }}" data-gallery="page" title="{{ $figure['alt'] }}">
				<?php echo \App\thumber($figure['src'], 645, 373, $figure['class'], $figure['alt'], $figure['alt'], ); ?>
			</a>
		</div>
	<?php endforeach; ?>
<?php endforeach; ?>
</div> 
?>