Checking if an object attribute is set - SimpleXML

php xml object simplexml

Brett · Jun 6, 2012 · Viewed 17.6k times · Source

I have some XML I am using PHP's SimpleXML class with and I have elements within the XML such as:

<condition id="1" name="New"></condition>
<condition id="2" name="Used"></condition>

However they are not always there, so I need to check if they exist first.

I have tried..

if (is_object($bookInfo->page->offers->condition['used'])) {
    echo 'yes';
}

as well as..

if (isset($bookInfo->page->offers->condition['used'])) {
    echo 'yes';
}

But neither work. They only work if I remove the attribute part.

So how can I check to see if an attribute is set as part of an object?

Answer

What you're looking at is the attribute value. You need to look at the attribute (name in this case) itself:

if (isset($bookInfo->page->offers->condition['name']) && $bookInfo->page->offers->condition['name'] == 'Used')
    //-- the rest is up to you