如何从PHP中的html页面中删除H2和H3标签？

sub-info 是类,而不是标记名,因此您使用DOMDocument是有缺陷的,您可能更好地使用XPath查询.

$strhtml='

            
            

                

                        iPhone 4S
                
                

                    16GB Black 
                
            
        
';


$doc = new DOMDocument();
$doc->loadHTML( $strhtml );
$xpath=new DOMXPath( $doc );
$col=$xpath->query('//div[@class="sub-info"]/h2|//div[@class="sub-info"]/h3');
if( $col ){
    /* You could store results from query in an array */
    $tags=array();
    foreach( $col as $node ) {

        /* Simplest form to display results on separate lines, use br tag */
        echo $node->nodeValue . '
';

        /* Add tags to array - a rethink would be required if there are multiple h2 and h3 tags! */
        $tags[ $node->tagName ]=$node->nodeValue;

    }
    /* echo back results from array */
    echo $tags['h2'];
    echo '
';
    echo $tags['h3'];
}