Cannot display data using DOMDocument and xpath, why?

Question

I'm trying to get data from 17track.net, i mean when i tracking a number i got the result in the result box, but i can't display it in my file.

this is my code:

<?php
//RA190265307CN is the tracking number 

$result = array();
$classname = "tb-stat";
$domdocument = new DOMDocument();
$domdocument->loadHTMLFile('http://www.17track.net/en/result/post.shtml?nums=RA190265307CN');
$a = new DOMXPath($domdocument);
$spans = $a->query("//*[contains(concat(' ', normalize-space(@class), ' '), ' $classname ')]");

for ($i = $spans->length - 1; $i > -1; $i--) {
    $result[] = $spans->item($i)->firstChild->nodeValue;
}

echo "<pre>";
print_r($result);    ?>

Thats the result of the array:

Array
(
    [0] => 
)

Whats wrong with my code? I'm trying to get the "Status" of the tracking number.

Answer 1

The firstChild will select a child <colgroup> which is empty. I think you want to replace

$result[] = $spans->item($i)->firstChild->nodeValue;

by

$result[] = $spans->item($i)->nodeValue;

This currently returns

Not Found(0) / Transporting(0) / Pick Up(0) / Delivered(0)

If you want to descend into this string even further you can take advantage of the fact that the status values "(0)" are braced in <em> tags. So, for example changing yout XPATH expression to

$query = "//*[contains(concat(' ', normalize-space(@class), ' '), ' $classname ')]//em";

will select the individual status and put them into the array result. Using the index 0..3 you will be able to randomly access the status. If you want to have a numeric value you will still have to extract it from the string.