当数组为null时，PHP没有对象错误

Question

I have a RSS feed URL and I am using following PHP function to extract values from it.

$xml = simplexml_load_file($url);

Its working perfect when the $url generates some results. And I am using count() function to count the length of array thats extracted from RSS feeds.

$length=sizeof($xml->rs[0]->r);

But when there is no result in RSS it gives me error

Trying to get property of non-object in /home/****/public_html/index.php on line 5 

So is there a way to echo a message if there are no results in RSS feed URL.

And when i do print_r($xml) ob no results $xml , i get

SimpleXMLElement Object ( [@attributes] => Array ( [type] => noresults [code] => 1.1 ) [title] => SimpleXMLElement Object ( ) [subtitle] => SimpleXMLElement Object ( ) [text] => SimpleXMLElement Object ( ) [base] => SimpleXMLElement Object ( ) ) )

I searched everywhere and found no solution.. Thanks for your help.

Answer 1

$xml = simplexml_load_file($url);

if ($xml && property_exists($xml, 'rs') && is_array($xml->rs) && isset($xml->rs[0]) && is_object($xml->rs[0]) && property_exists($xml->rs[0], 'r')) {
    // do something with $xml->rs[0]->r
} else {
    echo "Not available to access $xml->rs[0]->r";
}