Question

我正在解析从Google Map API V3返回的XML。以下是返回的典型XML：

<?xml version="1.0" encoding="UTF-8" ?>
<kml xmlns="http://earth.google.com/kml/2.0"><Response>
  <name>40.74445606,-73.97495072</name>
  <Status>
    <code>200</code>
    <request>geocode</request>
  </Status>
  <Placemark id="p1">
    <address>317 E 34th St, New York, NY 10016, USA</address>
    <AddressDetails Accuracy="8" xmlns="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0"><Country><CountryNameCode>US</CountryNameCode><CountryName>USA</CountryName><AdministrativeArea><AdministrativeAreaName>NY</AdministrativeAreaName><Locality><LocalityName>New York</LocalityName><Thoroughfare><ThoroughfareName>317 E 34th St</ThoroughfareName></Thoroughfare><PostalCode><PostalCodeNumber>10016</PostalCodeNumber></PostalCode></Locality></AdministrativeArea></Country></AddressDetails>
    <ExtendedData>
      <LatLonBox north="40.7458050" south="40.7431070" east="-73.9736017" west="-73.9762997" />
    </ExtendedData>
    <Point><coordinates>-73.9749507,40.7444560,0</coordinates></Point>
  </Placemark>
</Response></kml>

这是我用来解析它的PHP代码片段：

$xml = new SimpleXMLElement($url, null, true);
$xml->registerXPathNamespace('http', 'http://earth.google.com/kml/2.0');
$LatLonBox_result = $xml->xpath('//http:LatLonBox');

echo "North: " . $LatLonBox_result[0]["north"] . "\n";
echo "South: " . $LatLonBox_result[0]["south"] . "\n";
echo "East: " . $LatLonBox_result[0]["east"] . "\n";
echo "West: " . $LatLonBox_result[0]["west"] . "\n";

var_dump($LatLonBox_result);

以下是编辑后的输出：

North: 40.7458050
South: 40.7431070
East: -73.9736017
West: -73.9762997
array(1) {
  [0]=>
  object(SimpleXMLElement)#10 (1) {
    ["@attributes"]=>
    array(4) {
      ["north"]=>
      string(10) "40.7458050"
      ["south"]=>
      string(10) "40.7431070"
      ["east"]=>
      string(11) "-73.9736017"
      ["west"]=>
      string(11) "-73.9762997"
    }
  }
}

使用$ LatLonBox_result [0] [“north”]看起来很丑陋。这是使用xpath时的情况吗？我期待返回的值可能类似于$ LatLonBox_result [“north”]而没有数组的第一个维度。或者这种做法是错误的？如果有更好的方法，请赐教。谢谢！

Answer 1

SimpleXMLElement::xpath返回始终数组（事实上你得到它的第一个元素）并找到结果（无论它们只是一个或多个）），或FALSE如果有错误。

我认为你的代码很好，除了不是很强大。在使用empty($result)做任何其他事情之前，最好先用$LatLonBox_result = $xml->xpath('//http:LatLonBox'); if (!empty($LatLonBox_result)) { echo "North: " . $LatLonBox_result[0]["north"] . "\n"; echo "South: " . $LatLonBox_result[0]["south"] . "\n"; echo "East: " . $LatLonBox_result[0]["east"] . "\n"; echo "West: " . $LatLonBox_result[0]["west"] . "\n"; }检查结果。

{{1}}

在PHP中有更优雅的方法来解析这个xpath对象吗？

1 个答案: