php SimpleXML attributes are missing

Question

I have the following xml document here: Edit: (see below for sample)

I am using php/SimpleXML to covert it to an object to read it:

$xmlContent = fil         


        

Answer 1

The simple answer here is not to use print_r() with SimpleXML objects. Because they are wrappers around non-PHP data, functions like that which would normally show the "whole" object don't really reflect what you're looking at.

The way to access an attribute with SimpleXML is to use the attribute name as though it was an array key ($node['attribute']); this does not mean that there is an array somewhere with that key, it is a function-call in disguise.

If you want to get a feel for which nodes you're looking at while writing SimpleXML code, check out this simplexml_dump() function which I wrote (feedback welcome).

Answer 2

First, you have to get the SimpleXMLElement object. In this case:

$xmlContent = file_get_contents($path . '/test.xml');
$tablesRaw = new SimpleXMLElement($xmlContent);
$elements = $tablesRaw->table[22]->fields->field[31]->{'acceptable-values'}->children();

Now, you can iterate over each acceptable-value object and use the attributes() method:

foreach($elements as $element) {
    echo $element->attributes()->value . " ";
    echo trim($element[0]) . "\n";
}

With your XML, that will print:

0 Unknown
1 Invalid
2 Deleted
3 Valid/Good
4 Inactive

It doesn't rely on the array index, because the call to attributes() gets the actual attributes of the element. And ->value gets the attribute with the name "value".