Question

如何使用XPath获取节点的值？

获取价格高于35 的所有节点

/bookstore/book[price>35.00]

但是当我改变＆gt;对于= =等于，查询失败。请帮忙。顺便说一下，我使用的是php，但这并不重要，因为XPath是通用的。

这是我正在使用的php代码和xml代码

$xml = "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>
 <bookstore>
 <book>
   <title lang=\"eng\">Harry Potter</title>
   <price>29.99</price>
 </book>
 <book>
   <title lang=\"eng\">Learning XML</title>
   <price>39.95</price>
 </book>
 </bookstore>"; $xml = new SimpleXMLElement($xml);

    $name = 'Shiny Red';
    $nodes = $xml->xpath(sprintf('/bookstore/book[price>35.00]', $name));
    if (!empty($nodes)) {
        printf('At least one building named "%s" found<hr/>', $name);
    echo "<textarea style=\"width: 400px; height: 300px;\">";print_r($nodes); echo "</textarea>";
    } else {
        printf('No building named "%s" found', $name);
    }

Answer 1

//bookstore/book/price[. ='35.00']

或

//bookstore/book[price='35.00']

诀窍在引号中。节点值是文本。但是，您不会将任何内容与'35 .00'匹配，但这是因为您的XML不包含具有该价格的图书。匹配'39 .95'将起作用（测试）。

$xml = "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>
 <bookstore>
 <book>
   <title lang=\"eng\">Harry Potter</title>
   <price>29.99</price>
 </book>
 <book>
   <title lang=\"eng\">Learning XML</title>
   <price>39.95</price>
 </book>
 </bookstore>"; $xml = new SimpleXMLElement($xml);

    $name = 'Shiny Red';
    $nodes = $xml->xpath(sprintf('//bookstore/book/price[. = \'39.95\']', $name));
    if (!empty($nodes)) {
        printf('At least one building named "%s" found<hr/>', $name);
    echo "<textarea style=\"width: 400px; height: 300px;\">";print_r($nodes); echo "</textarea>";
    } else {
        printf('No building named "%s" found', $name);
    }

如何使用XPath获取节点的值？

1 个答案: