Problemas de memory con web scraping

$arrayMultidimensional = array(array(),array(),array(),array());
$nombre 		= array();
$precio 		= array();
$img 			= array();
$descriptionURL	= array();
$description	= array();
$menu_principal = array();


require 'simple_html_dom.php';

$html = file_get_html("http://www.pccomponentes.com/placas_base.html");


$count=0;
$countCategoria = 0;
$countSubCategoria = 0;

foreach ($html->find('div.menu-familias a') as $value) {
	array_push($menu_principal, $value->href);
	foreach ($html->find('div.articulo-familia span[itemprop="name"]') as $value) {
		array_push($nombre, $value);
	}
	foreach ($html->find('div.articulo-familia span[class=precio]') as $value) {
		array_push($precio, $value);
	}

foreach ($html->find('div.articulo-familia div[class=foto-bandera] a img') as $value) {
	array_push($img, $value->src);
}
foreach ($html->find('div.articulo-familia span[class="nombre"] a') as $value) {
	array_push($descriptionURL, $value->href);
	$html2 = file_get_html($value->href);
	foreach ($html2->find('div.detalleCaracteristicas') as $key => $value) {
		array_push($description, $value);
	}
	
}
}


for ($i=0; $i < count($descriptionURL); $i++) {
	$html2 = file_get_html($descriptionURL[$i]);
	foreach ($html2->find('div.detalleCaracteristicas') as $value) {
			array_push($description, $value);
		}
}

array_push($arrayMultidimensional, $nombre);
array_push($arrayMultidimensional, $precio);
array_push($arrayMultidimensional, $img);
array_push($arrayMultidimensional, $description);



//var_dump($menu_principal);
$tabla = "<table border='1'>";
$tabla .= "<tr>";
$tabla .= "<td>Nombre</td><td>Precio</td><td>Imagen</td><td>Description</td>";
$tabla .= "</tr>";
for ($i=0; $i <count($nombre); $i++) {
	$tabla .= "<tr>";
	$tabla .= "<td>" . $nombre[$i] . "</td>";
	$tabla .= "<td>" . $precio[$i]. "</td>";
	$tabla .= "<td><img src='" . $img[$i] . "'></td>";
	$tabla .= "<td>" . $description[$i]. "</td>";
	$tabla .= "</tr>";
}
$tabla .= "</table>";

echo $tabla;