如何在PHP中只获得p标签的alt属性?

我正在编写一个只显示价格的脚本。如果我这样做:

$alttag = $oNode['p'];
echo $alttag;

它将回显<p></p>中的所有内容。所以它会回显:

网址:cafeïnevrijPak 500克

每公斤价格1,99

，所以你可以看到它是199，这是价格，但首先我只需要199在<p></p>，我想。或者，在199之间，它将显示1,99或1.99。

如果我这样做:

$alttag = $oNode['p sup'];
echo $alttag;

它只会在<sup></sup>中回波99如果我这样做:

$alttag = $oNode['p sup'];
$maintag = $oNode['p']->attr('alt');
echo $maintag . $alttag;

嗯…这没有任何作用我怎么能只得到1和99，然后放a。或者，在它之间看起来像1 99或1.99?

 <div class="item-prijs">
        <p>
            <cufon class="cufon cufon-canvas" alt="1" style="width: 27px; height: 42px; ">
                <canvas width="47" height="43" style="width: 47px; height: 43px; top: -1px; left: -2px; "></canvas>
                <cufontext>1</cufontext>
            </cufon>
            <sup>
                <cufon class="cufon cufon-canvas" alt="99" style="width: 24px; height: 20px; ">
                    <canvas width="35" height="21" style="width: 35px; height: 21px; top: -1px; left: -1px; ">
                    </canvas><cufontext>99</cufontext>
                </cufon>
            </sup>
        </p>
    </div>

// Extracts offers from html and return in array
function extractSparOffers($url)
{
    loadPqUrl($url);
    //Test $dates  = extractDateRange(pq('.contentdatagrid td:first'));
    $oNodes = pq('.item');
    if($oNodes->count() == 0) throw new Exception('No offers were found.');
    foreach($oNodes as $oNode) {
        $oNode = pq($oNode);
        //Test $titleDescCell = $oNode['input#a']->parent();
        //Test $titleDescCell['img, input']->remove();
        $priceCell = $oNode['span.price1']->parent()->parent();
        // Get title and description
        $data['title']                          = $oNode['.item-content h3'];
        $data['description']                    = $oNode['.item-content p'];
        // Get prices (page may contain price ranges)

        $alttag = $oNode['p sup'];
        $maintag = $oNode['p']->attr('alt');
        echo $maintag;
        //echo $alttag;
        //$alttags=preg_match_all('/<img[^>]*alt="([^"]*)"/i', $html, $matches);
        $none = "0.00";
        $data['priceBefore']                    = $none;
        $data['priceAfter']                     = $alttag;
        //                                        $oNode['item-prijs p.sup.cufon cufon-canvas']->attr('alt') ;
        // Get image  
        $imgNode = $oNode['img:only-child'];
        if(count($imgNode) > 0)
            $img = getimg('http://www.spar.nl/' . $oNode['img:only-child']->
                          attr('src'));
        else $img = '';                                     
        $data['image']                          = $img;
    //Test  $data['dateStart']                      = $dates['start'];
    //Test  $data['dateEnd']                        = $dates['end'];
    $date                    =date('Y-m-d');
    $data['dateStart']  = date('Y-m-d',  strtotime("yesterday"));
    $data['dateEnd']                    = date('Y-m-d', strtotime("tomorrow"));
        $data = formatOfferStrings($data);
        $odTotal[] = $data;
    }
    return $odTotal;
}
spiderInit();
$offerData = extractSparOffers('http://www.spar.nl/aanbiedingen/');
//Test processNewOffers('Spar', $offerData, $offerData[0]['dateStart']);
processNewOffers('Spar', $offerData, $dates['start']);

?>