[英]PHP DOMXPath - Can't target the right node
I know this is probably covered in other threads, but I've been searching all over StackOverflow and tried many solutions, this is why I'm asking. 我知道这可能在其他线程中涵盖了,但是我一直在StackOverflow上进行搜索并尝试了许多解决方案,这就是我要问的原因。
With this html: 与此HTML:
<div class="someclass">
<table>
<tbody>
<tr>
<th class="state">Status</th>
<th class="name">Name</th>
<th class="type">Type</th>
<th class="length">Length</th>
<th class="height">Height</th>
</tr>
<tr>
<td class="state state2"></td>
<td class="name"></td>
<td class="type t18"></td>
<td class="length">2000 m</td>
<td class="height"></td>
</tr>
<tr>
<td class="state state1"></td>
<td class="name"></td>
<td class="type t18"></td>
<td class="length">2250 m</td>
<td class="height"></td>
</tr>
<tr>
<td class="state state1"></td>
<td class="name"></td>
<td class="type t18"></td>
<td class="length">3000 m</td>
<td class="height"></td>
</tr>
<tr>
<td class="state state2"></td>
<td class="name"></td>
<td class="type t18"></td>
<td class="length">2250 m</td>
<td class="height"></td>
</tr>
</tbody>
</table>
</div>
Now, this is the PHP code I have so far : 现在,这是我到目前为止拥有的PHP代码:
$dom = new DOMDocument();
$dom->loadHtmlFile('http://www.whatever.com');
$dom->preserveWhiteSpace = false;
$xp = new DOMXPath($dom);
$col = $xp->query('//td[contains(@class, "state1") and (contains(@class, "state"))]');
$length = 0;
foreach( $col as $n ) {
$parent = $n->parentNode;
$length += $parent->childNodes->item(3)->nodeValue;
}
echo 'Length: ' . $length;
I need to: 我需要:
1.- Sum the 'length' values so I can echo them, getting rid of the ' m' substring of the given values . 1.- 对“长度”值求和,以便我可以回显它们, 摆脱给定值的“ m”子串 。
2.- Understand why I'm getting wrong the 'parentNodes', 'childNodes' and 'item()' parts . 2.-了解为什么我弄错了'parentNodes','childNodes'和'item()'部分 。 With many tries I've gotten 'Length: 0'
经过多次尝试,我得到了“长度:0”
I know this isn't the place to get a full detailed explanation, but it is really hard to find tutorials targetting these concrete issues. 我知道这里不是获得完整详细说明的地方,但是很难找到针对这些具体问题的教程。 It would be great if someone could give some advice on where I can get this information.
如果有人可以就我可以从何处获得此信息提供建议,那将是很好的。
Thanks very much in advance. 首先十分感谢。
Edited the 'Concat' part for simplicity. 为简单起见, 编辑了“ Concat”部分。
Navigation through DOMDocument for a specified childNode value by using DOMXpath 使用DOMXpath在DOMDocument中导航指定的childNode值
function getInt($string)
{
preg_match("/[0-9]+/i", $string, $val);
$out = 0;
if (isset($val) && !empty($val))
{
$out = $val[0];
}
return intval($out);
}
$dom = new DOMDocument();
$dom->loadHtml($html);
$dom->preserveWhiteSpace = false;
$xp = new DOMXPath($dom);
$length = 0;
foreach($xp->query('//td[@class="state state1"]/following-sibling::*[3]') as $element)
{
$value = $element->nodeValue;
$length += getInt($value);
}
echo $length;
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