PHP: documentElement->childNodes warning

Question

$xml = file_get_contents(example.com);

$dom = new DomDocument();
$dom->loadXML($xml);

$items = $dom->documentElement;

foreach($items->childNodes as $item) { 
 $childs = $item->childNodes;
 foreach($childs as $i) {
  echo $i->nodeValue . "<br />";
 }
}

Now I get this warning in every 2nd foreach:

Warning: Invalid argument supplied for foreach() in file_example.php  on line 14

Please help guys. Thanks!

Solution

Some nodes don't have children, so you're passing a null (invalid) argument to the foreach (just like the warning says).

To avoid the warnings you need to check if the current node has any children. For that you can use the DOMNode::hasChildNodes() method:

foreach($items->childNodes as $item) { 
    if ($item->hasChildNodes()) {
        $childs = $item->childNodes;
        foreach($childs as $i) {
            echo $i->nodeValue . "<br />";
        }
    }
}

Comments

[Gordon]

The error message suggests that $childs is not an iterable type. Please provide a short extract of the XML you are parsing.

[Loreto Gabawa Jr.]

@Gordon, thanks! i am bad at naming vars ;)