php crawling

<?php

// http://localhost/homepage/crawling/a.php


ini_set("allow_url_fopen",1);
include "simple_html_dom.php";
 $data = file_get_html("https://naver.com");

// echo $data;
/*
$a = $data ->find("ul");
foreach($a as $b){
    echo $b;
}
*/
$i = 1;
foreach($data->find("ul.list_theme")as $ul){
    foreach($ul -> find("li") as $li){
        echo $li ->plaintext;
        echo "<br><br>";
    }
}


?>