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$dom->loadHTMLFile() error

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I wrote a small block of code for a mate that parses another web page and 
it displays selected results from a table there. It runs fine locally using 
php 5.3. I'm not sure what version of php is in use on his web server, but
it appears that "<?php ... $dom->" is being parsed as a single tag in the 
following code:

----------BEGIN code----------------------
<?php

// Get the node_id from what was passed to this page.
if (isset($_GET['node_id'])) {
  $node_id = $_GET['node_id'];
} else {
  echo "No IRLP node number stated\n";
  break 3;
}

// Get the node status HTML code.
$url = "http://status.irlp.net/?nodeid=$node_id" ;
$dom = new DOMDocument;
$dom->loadHTMLFile("$url");
$links = $dom->getElementsByTagName('td');
foreach($links as $i){
  $node_status[] = $i->textContent;
}

// Print the fields of interest. Comment undesired lines such as:
//echo "<b>$node_status[40]</b> $node_status[41]<br>";
echo "<b>$node_status[40]</b> $node_status[41]<br>";
echo "<b>$node_status[42]</b> $node_status[43]<br>";
echo "<b>$node_status[44]</b> $node_status[45]";

?>
----------END code----------------------

On my php5.3, it returns (e.g. sans bold):

Local node date/time 14:39:10 on Nov 07 2013 CST
Current Node Status: IDLE for 0 days, 1 hours, 43 minutes, 7 seconds.
Last heard from Node: 12:56:02 on Nov 07 2013 CST

On his http://stn3717.ip.irlp.net:15426/get_node_status.php?node_id=3717

loadHTMLFile("$url"); $links = $dom->getElementsByTagName('td'); 
foreach($links as $i){ $node_status[] = $i->textContent; } 
// Print the fields of interest. Comment undesired lines such as: 
//echo "$node_status[40] $node_status[41]"; 
echo "$node_status[40] $node_status[41]"; 
echo "$node_status[42] $node_status[43]"; 
echo "$node_status[44] $node_status[45]"; ?> 

Is it possible that php isn't operational on that site, or that it
needs to be enabled on a per-user basis?

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$dom->loadHTMLFile() error gdunn <gdunn@example.com> - 2013-11-07 20:47 +0000
  Re: $dom->loadHTMLFile() error Jerry Stuckle <jstucklex@attglobal.net> - 2013-11-07 17:46 -0500
    Re: $dom->loadHTMLFile() error Arno Welzel <usenet@arnowelzel.de> - 2013-11-08 08:35 +0100
      Re: $dom->loadHTMLFile() error Jerry Stuckle <jstucklex@attglobal.net> - 2013-11-08 07:57 -0500
  Re: $dom->loadHTMLFile() error Arno Welzel <usenet@arnowelzel.de> - 2013-11-08 08:35 +0100
    Re: $dom->loadHTMLFile() error gdunn <gdunn@example.com> - 2013-11-08 19:28 +0000

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