Buscar cadena en remoto

[bepese]

Lo siento, voy algo perdido, a ver si esto echa un cable (:

Código PHP:

$file = "file.txt"; // xml formatted text file...   <---- url remota?
  $doc = new DOMDocument();
  $doc->loadHTMLFile($file);
  
  $xpath = new DOMXpath($doc);
  
  // example 1: for everything with an id
  //$elements = $xpath->query("//*[@id]");
  
  // example 2: for node data in a selected id
  //$elements = $xpath->query("/html/body/div[@id='yourTagIdHere']");
  
  // example 3: same as above with wildcard
  //$elements = $xpath->query("*/div[@id='player']");
  
  if (!is_null($elements)) {
    foreach ($elements as $element) {
  //    echo "<br/>[". $element->nodeName. "]";
  
      $nodes = $element->childNodes;
      foreach ($nodes as $node) {
        echo $node->nodeValue. "\n";
      }
    }
  }
 
?>
 

y/o

Código PHP:

$nodes = $element->childNodes;
foreach ($nodes as $node) {
$line_content $node->nodeValue;
 
preg_match('/(file_url=).?*(&)/is',$line_content,$return);
if(!empty($return[0])){$results[] = $line_content; unset($return);}
}
?>