“为foreach（）提供的参数无效”阅读XML？
问题描述：
IM gettin: "Invalid argument supplied for foreach()"
in the for each line when trying to read an specific item of the xml
PHP:
$urls="http://www.floatrates.com/daily/usd.xml";
$url= $urls;
$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
$data = curl_exec($ch);
curl_close($ch);
$feed = new SimpleXMLElement($data,LIBXML_NOCDATA);
foreach ($feed->channel->item as $item) {
$title = $item->title;
if (preg_match('/ARS/',$title)) {
echo $title;
}
}
答
$urls = "http://www.floatrates.com/daily/usd.xml";
$url = $urls;
$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
$data = curl_exec($ch);
curl_close($ch);
$feed = new SimpleXMLElement($data, LIBXML_NOCDATA);
foreach ($feed->children() as $item) {
if ("item" == $item->getName()) {
$title = $item->title;
if (preg_match('/ARS/', $title)) {
echo $title;
}
}
}
答
It probably means that $feed does not contain what you expect it to contain, and you are not passing array to foreach Use print_r($feed); to see that it actually contains, and go from there.