PHP xpath从特定ID的网页中提取值

Question

我需要一些xpath的帮助来从html页面中提取$ 283的值.

这是我的PHP

$html = file_get_contents("https://test.com/testpage.php");
$html = tidy_repair_string($html);
$doc = new DomDocument();
$doc->loadHtml($html);
$xpath = new DomXPath($doc);

$avg = $xpath->evaluate('string(//*[@id="Average"]/@value)');
echo $avg;

这是HTML

<div class="List">
    <span class="bold">Avg</span> 
    <span id="Average">$283</span>
</div>

提前致谢.

Answer 1

试试这个XPath表达式:

//div[@class="List"]/span[@id="Average"]

或者干脆:

//*[@id='Average']

这是一个完整的代码:

<?php
$doc = new DOMDocument();
$doc->loadHTMLFile('http://127.0.0.1/test.html');

$xpath = new DOMXpath($doc);

$elements = $xpath->query("//*[@id='Average']");

if (!is_null($elements)) {
    foreach ($elements as $element) {
        $nodes = $element->childNodes;
        foreach ($nodes as $node) {
            echo $node->nodeValue. "\n";
        }
    }
}
?>

只需用您自己的URL替换URL即可.