[英]How can I automatically add the image "alt" attribute using image filename if it is missing, using php?
[英]How can I only get the alt attribute of the a p tag in PHP?
我正在编写一个仅以价格作为回应的脚本。 如果我做:
$alttag = $oNode['p'];
echo $alttag;
它将回显<p></p>
。 因此它将回显:
咖喱白萝卜500克
2包
每公斤prijs 1,99
199
从网站上可以看到它的回声是199,也就是价格,但是首先我只需要<p></p>
中的199,然后我要。 或,介于199之间,因此将显示1,99或1.99。
如果我做:
$alttag = $oNode['p sup'];
echo $alttag;
如果这样做,它只会在<sup></sup>
回显99:
$alttag = $oNode['p sup'];
$maintag = $oNode['p']->attr('alt');
echo $maintag . $alttag;
好吧...这什么也没做我怎么只能得到1和99并放置一个。 或,它看起来像是1,99还是1.99?
<div class="item-prijs">
<p>
<cufon class="cufon cufon-canvas" alt="1" style="width: 27px; height: 42px; ">
<canvas width="47" height="43" style="width: 47px; height: 43px; top: -1px; left: -2px; "></canvas>
<cufontext>1</cufontext>
</cufon>
<sup>
<cufon class="cufon cufon-canvas" alt="99" style="width: 24px; height: 20px; ">
<canvas width="35" height="21" style="width: 35px; height: 21px; top: -1px; left: -1px; ">
</canvas><cufontext>99</cufontext>
</cufon>
</sup>
</p>
</div>
完整代码:不包含php函数和datbase连接。
// Extracts offers from html and return in array
function extractSparOffers($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']);
?>
那么,这基本上就是价格的网络爬虫吗? 我建议您考虑使用PHP的DOMDocument库来解析XML(实际上是XHTML)。 然后,您可以执行以下操作:
//create a new DOMDocument object
$xmlDoc = new DOMDocument();
//load your html for parsing
$xmlDoc->loadHTML("<html><body>Your HTML Code<br></body></html>");
//select the element that you want the attribute from...you may need to use $xmlDoc->getElementsByTagName('p');
$p_element = $xmlDoc->getElementById('yourtag');
//get the attribute alt of the selected element
$alt = $p_element->getAttribute('alt');
//show alt attribute value
echo $alt;
这只是伪代码,不会解决您的问题,但是,它似乎比您尝试使用的解析器更好。 查看这些链接以获取更多信息(我希望这会有所帮助):
http://www.php.net/manual/zh/domdocument.construct.php
http://php.net/manual/zh/domelement.getattribute.php
http://www.php.net/manual/zh/domdocument.getelementsbytagname.php
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.