对于每个密钥不是一个数字

So I'm trying to iterate through an XML feed and paginate it but I've run into a problem. When I try to get the index (key) of the current array it outputs a string "campDetails" on every iteration instead of an incrementing integer like 0,1,2,3

Here is a sample of the XML format

<campaigns>
<campDetails>
<campaign_id>2001</campaign_id>
<campaign_name>Video Chat Software</campaign_name>
<url>http://www.fakeurl.com</url>
</campDetails>

<?php
 $call_url = "https://www.fakeurl.com";
  if($xml = simplexml_load_file($call_url, "SimpleXMLElement", LIBXML_NOCDATA)):

           foreach($xml as $i => $offers):
                $offer_link     = $offers->url;
                $offer_raw_name = $offers->campaign_name;
              echo $i . " " . $offer_link; ?> </br> <?php echo $offer_raw_name;
           endforeach;
  endif;
  ?>

Output to be expected:

0 http://www.fakeurl.com
Video Chat Software

Actual output:

campDetails http://www.fakeurl.com
Video Chat Software

EDIT: Thank you for your answers everyone. It seems I was given incorrect information from another question on here. I was told that $i would keep a numerical index for the current iteration.

print_r($xml); (obviously more results but this is the first)

SimpleXMLElement Object ( [campDetails] => Array ( [0] => SimpleXMLElement Object ( [campaign_id] => 2001 [campaign_name] => Video Chat Software [url] => http://www.fakeurl.com/ )

Instead of using the current foreach and associative array, I pushed all values to an indexed array.

In this usage of foreach, $i is not a numeric index but a key. In this case, the key for the current object is campDetails.

Alternative Code

$i = 0;
foreach($xml as $offer) {
    // your code...
    ++$i;
}

For more details on the type of object you receive from simplexml_load read the docs or debug with print_r($xml);.

Your $i is not an index. You could do something like:

$index = 0;
foreach($xml as $i => $offers):
    $offer_link     = $offers->url;
    $offer_raw_name = $offers->campaign_name;
    echo $index++ . " " . $offer_link; ?> </br> <?php echo $offer_raw_name;
endforeach;

simplexml_load_file returns an object, a foreach loop will iterate over its fields, and $i will hold the current field's key.

If you want a numeric counter as well, just increment on your own:

$j = 0;
foreach($xml as $i => $offer){

    // do your stuff
    $j++;

}

Its a bit redundant, but you can use something like:

$x = 0;
foreach($xml as $i => $offers):
    // other stuff
    echo $x . " " . $offer_link; ?> </br> <?php echo $offer_raw_name;
    $x++;
endforeach;

You can also streamline your echo line like so:

echo "$i $offer_link <br> $offer_raw_name";