My PHP code give some error! In the root..

Dear all,

I have some problem with my php code i try to make some XML and PHP Content managmant system, but i have now some problem with the root?

He give the next error: Fatal error: Call to a member function root() on a non-object in /home/......./public_html/searchArticles.php on line 29


See here my code please:

<?php
session_start();
$results = array();

//this is a very simple, potentially very slow search
function extractText($array){
if(count($array) <= 1){
//we only have one tag to process!
for ($i = 0; $i<count($array); $i++){
$node = $array[$i];
$value = $node->get_content();
}
return $value;
}

}

$dh = opendir('./xml/');

while ($file = readdir($dh)){
if (eregi("^\\.\\.?$", $file)) {
continue;
}
$open = "./xml/".$file;
$xml = "domxml_open_file" .$open;

//we need to pull out all the things from this file that we will need to
//build our links
$root = $xml->root("id");

$id = $root->get_attribute("id");

$stat_array = $root->get_elements_by_tagname("status");
$status = extractText($stat_array);

$k_array = $root->get_elements_by_tagname("keywords");
$keywords = extractText($k_array);

$h_array = $root->get_elements_by_tagname("headline");
$headline = extractText($h_array);

$ab_array = $root->get_elements_by_tagname("abstract");
$abstract = extractText($ab_array);

if ($status != "live"){
continue;
}

if (eregi($searchTerm, $keywords) or eregi($searchTerm,$headline)){
$list['abstract'] = $abstract;
$list['headline'] = $headline;
$list['file'] = $file;
$results[] = $list;
}

}

$results = array_unique($results);

?>
<h1>Search Results</h1>
<a href="index.php">back to main</a>
<p>You searched for: <i><?php echo $searchTerm ?></i></p>
<hr>


<?php

if (count($results)>0){
echo "<p>Your search results:</p>";
foreach ($results as $key => $listing){
echo "<br><a href=\"showArticle.php?file=".$listing["file"]."\">" . $listing["headline"]."</a>\n";
echo "<br>". $listing["abstract"];
echo "<br>";
}
} else {

echo "<p>Sorry, no articles matched your search term.</p>";
}

?>

PHP:

I hope for some sugestions, Thanks a lot!

 

What is supposed to happen in this line?

$xml = "domxml_open_file" .$open;

PHP:

This creates a string, but on next line $xml object is expected, that's why it fails.

 

Thanks for the help,

Maby a stuped ask but what do you mean with the object is expected?

 

The code clearly shows, that $xml object is used to manipulate the dom.
As to what objects and classes are, you can read in php manual in OOP section - http://php.net/manual/en/language.oop5.php.