XPath查询：从标签获取属性href [英] XPath Query: get attribute href from a tag
问题描述
我想使用XPath从 a -tag获取 href 属性，但它有两处出现在同一个文件中。我怎么相处？
我需要检查IF是否存在具有值$ street / object的 href 属性，我已经得到了这段代码，它不起作用：
I want to use XPath to get the href attribute from an a-tag, but it has two occurrences within the same file. How am I getting along?
I need to check IF there is an href attribute with value $street/object, I have got this code and it does not work:
$product_photo = $xpath->query("//a[contains(@href,'{$object_street}fotos/')][1]");
$product_360 = $xpath->query("//a[contains(@href,'{$object_street}360-fotos/')][1]");
$product_blueprint = $xpath->query("//a[contains(@href,'{$object_street}plattegrond/')][1]");
$product_video = $xpath->query("//a[contains(@href,'{$object_street}video/')][1]");
它根本不会返回任何东西。谁可以帮我解决问题？
It does not return anything at all. Who can help me out?
推荐答案
对于以下HTML文档：
For the following HTML document:
<html>
<body>
<a href="http://www.example.com">Example</a>
<a href="http://www.stackoverflow.com">SO</a>
</body>
</html>
xpath查询 / html / body // a / @ href （或简单地 // a / @ href ）将返回：
The xpath query /html/body//a/@href (or simply //a/@href) will return:
http://www.example.com
http://www.stackoverflow.com
选择一个特定的实例使用 / html / body // a [N] / @ href ，
To select a specific instance use /html/body//a[N]/@href,
$ /html/body//a[2]/@href
http://www.stackoverflow.com
要测试属性中包含的字符串并返回属性本身，请将标记上的检查放在属性上：
To test for strings contained in the attribute and return the attribute itself place the check on the tag not on the attribute:
$ /html/body//a[contains(@href,'example')]/@href
http://www.example.com
混合两者：
Mixing the two:
$ /html/body//a[contains(@href,'com')][2]/@href
http://www.stackoverflow.com
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