我更喜欢 DOMXPath 用于解决此类问题.非常灵活

I prefer DOMXPath for problems like this. It's very flexible

$domhtml = DOMDocument::loadHTML($html); 
$xpath = new DOMXPath($domhtml);
$query="/html/body/text()"; //gets all text nodes that are direct children of body

$txtnodes = $xpath->query($query);

foreach ($txtnodes as $txt) {
    echo $txt->nodeValue;
}