我如何使用xpath而不是foreach

Question

我想抓一个有3级抓取的网站。我得到所有页面，然后在每个页面中，我得到图像，标题，网址，将我重定向到一个唯一的页面，其中包含更多信息，如描述，日期，....所以，如果我使用foreach，它会给我错误的结果，如果我使用for代替foreach，它只返回一个对象。我该如何处理（使用for代替foreach）;

<?php 
   $stackHref=array();
   $eventDetail=array();

$sitecontent =  file_get_contents('https://www.everfest.com/music/edm-festivals');


    if($sitecontent === FALSE) {

        $error_log .= 'Error on  $sitecontent =  file_get_contents(https://www.everfest.com/music/edm-festivals) ';
        //insert_error($error_log);
    }
   //  echo $sitecontent;
   $dom = new DOMDocument();
   libxml_use_internal_errors(true);
   $dom->loadHTML($sitecontent);
   libxml_use_internal_errors(false);
   $xpath = new DOMXPath($dom);     
   $nodes = $xpath->query("(//ul[@class='pagination'])[1]/li/a/@href");
   // $all_area_set= ' ';
   //echo $sitecontent;
  if(!isset($nodes))
  {
       $error_log .= "Error on $nodes = $xpath->query((//ul[@class='pagination'])[1]/li/a/@href)";  
       //insert_error($error_log);
       echo $error_log;
  }

  // get total pages

  foreach ($nodes as $link) {
      $stackHref[]='https://www.everfest.com'.$link->nodeValue;      
  }

  //loop through each pages in order to scrape 
  $j=0;
  for($i=0;$i<count($stackHref);$i++){

      $sitecontent=file_get_contents($stackHref[$i]);

      if($sitecontent === FALSE) {

        $error_log .= 'Error on  $sitecontent =  file_get_contents(https://www.everfest.com/music/edm-festivals) ';
        //insert_error($error_log);
      }

      $dom= new DOMDocument();
      libxml_use_internal_errors(TRUE);
      $dom->loadHTML($sitecontent);
      libxml_use_internal_errors(FALSE);
      $innerXpath= new DOMXPath($dom);



              //get page link

              $pageLinks= $innerXpath->query('//div[@class="festival-card grow"]/a[1]/@href');

                  for ($a=0;$a <$pageLinks->length;$a++ ){
                      //get img src
                        $eventDetail[$j]['pagelink']='https://www.everfest.com'.$pageLinks[$a]->nodeValue;
                        $images= $innerXpath->query("//div[contains(@class,'columns medium-6 large-4')]/div[contains(@class,'grow')]/a/img/@src");
                      $eventDetail[$j]['img']=$images[$a]->nodeValue;
                          //get title
                           $titles= $innerXpath->query("//div[contains(@class,'clearfix')]/a[1]/text()");
                              $eventDetail[$j]['title']=$titles[$a]->nodeValue;

                                      // go inside of each pages in order to get description, date, venue
                                      $sitecontent=file_get_contents($eventDetail[$j]['pagelink']);
                                      $dom= new DOMDocument();
                                      libxml_use_internal_errors(TRUE);
                                      $dom->loadHTML($sitecontent);
                                      libxml_use_internal_errors(FALSE);
                                      $deepxpath= new DOMXPath($dom);
                                      $descriptions= $deepxpath->query('//div[@class="columns"]/div[contains(@class,"card-white")]/p[contains(@class,"")]/span[1]/following-sibling::text()[1]');

                                          $eventDetail[$j]['description']=$descriptions[$a]->nodeValue;

                                      //get date
                                      $dates= $deepxpath->query('//div[@id="signup"]/div[@class="row"]/div[contains(@class,"columns")][1]/p/text()[1]');

                                          $eventDetail[$j]['Date']=$dates[$a]->nodeValue;

                                      //get venue
                                      $venues= $deepxpath->query('//div[@id="signup"]/div[@class="row"]/div[contains(@class,"columns")][1]/p/text()[2]');

                                          $eventDetail[$j++]['venue']=$venues[$a]->nodeValue;



                                      }
                                      }     
?>