xPath 或运算符 2 计算两个以上? [英] xPath or operator two compute more than two?

问题描述

这是我的 xPath，但是我看到 |运算符只计算 2?我怎样才能使它超过两个?我在下面发布了我的代码

This is my xPath, however I see that the | operator computes only 2? How can I make it more than two? I posted my code below

function extractNodeValue($query, $xPath, $attribute = null) {
    $node = $xPath->query("//{$query}")->item(0);
    if (!$node) {
        return null;
    }
    return $attribute ? $node->getAttribute($attribute) : $node->nodeValue;
}


$document = new DOMDocument();
$document->loadHTMLfile(${'html'.$i});
$xPath = new DOMXpath($document);

    $tel = extractNodeValue('//*[@id="eventDetailInfo"]/div[3]/div[4] | //*[@id="eventDetailInfo"]/div[3]/div[3] | //*[@id="eventDetailInfo"]/div[3]/div[5]',$xPath);

推荐答案

当你写2+2+2时，+是一个二元运算符；你的表达意思是(2+2)+2.

When you write 2+2+2, the + is a binary operator; your expression means (2+2)+2.

与 XPath 中的 | 类似，它也是一个二元运算符，但由于结果与操作数的类型相同，因此它以相同的方式与自身组合:$x|$y|$z 表示 ($x|$y)|$z.

Similarly | in XPath is a binary operator, but because the result is of the same type as the operands, it composes with itself in the same way: $x|$y|$z means ($x|$y)|$z.

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