我知道这已经回答过了。我整个下午都在阅读所有建议和课程中的SimpleXML文档。但这似乎是一种特殊情况,我真的无法完成这项工作。
只是为了了解上下文,我在通过hook_file_save上传后在Drupal中解析一个GPX文件。
这就是我的NetBeans Debugger关于变量的内容。
我试图以人们在上一篇文章中建议的所有方式从字段的属性中读取“纬度”字段。我总是在字段中检索的内容(请参见lat5_1,_2,...)是另一个SimpleXMLElement,里面没有任何东西,只有一个CLASSNAME变量,其值为“ SimpleXMLElement ”。
这是XML文件(GPX文件)的摘录。
我真的不知道我在哪里做错了。我以为是因为我隔离了变量(SimpleXMLElement的行为有点奇怪),但事实并非如此。谢谢你的帮助。
我要添加一段代码来调试,并注意观察变量:
$xml = simplexml_load_file($file->uri);
$trkseg = $xml->trk->trkseg; // OK!
$trkpt = $trkseg->trkpt; // OK!
$trkpt_c = count($trkpt); // OK:1289 items
$latlon5 = $trkpt[5]->attributes(); // OK includes @attributes lat lon = 59.158234 5.867209
$latlon6 = $trkpt[6]->attributes(); // OK includes @attributes lat lon = 59.158225 5.867027
foreach ($trkseg->trkpt as $a => $b) {
$c = $b->attributes()->lat; // $b OK, $c has just classname.
echo $a, '="', $b, "\"\n";
}
$lat5_1 = $latlon5['lat']; // NO: has just CLASSNAME
$lat5_2 = $latlon5->lat; // NO: has just CLASSNAME
// $lat5_3 = $latlon5->attributes()->{'lat'};
// NOT COMPUTED! (says trying to get property of non object)
$attribute = $latlon5->attributes(); // NOT COMPUTED!
$lat5_4 = $attribute['lat']; // NOT COMPUTED!
$lat5_5 = $attribute['lon']; // NOT COMPUTED!
用于调试的XML摘录
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<gpx xmlns="http://www.topografix.com/GPX/1/1/">
<metadata>
<time>2009-04-06T19:08:57Z</time>
</metadata>
<trk>
<name>Imported</name>
<trkseg>
<trkpt lat="59.158021" lon="5.868032">
<ele>0</ele>
<time>2007-05-21T06:00:00Z</time>
</trkpt>
<trkpt lat="59.158028" lon="5.868011">
<ele>0</ele>
<time>2007-05-21T06:01:53Z</time>
</trkpt>
[...]
</trkseg>
</trk>
</gpx>
我从SimpleXMLElement :: attributes提取并修改了此代码
<?php
$string = <<<XML
<a>
<foo name="one" game="lonely">1</foo>
</a>
XML;
$xml = simplexml_load_string($string);
$attribute = $xml->foo[0]->attributes();
print $attribute['name'];
?>
您可能会使用类似:
$attribute = $latlon5->attributes();
print $attribute['lat'];
print $attribute['lon'];
更新:
<?php
$string = <<<XML
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<gpx xmlns="http://www.topografix.com/GPX/1/1/">
<metadata>
<time>2009-04-06T19:08:57Z</time>
</metadata>
<trk>
<name>Imported</name>
<trkseg>
<trkpt lat="59.158021" lon="5.868032">
<ele>0</ele>
<time>2007-05-21T06:00:00Z</time>
</trkpt>
<trkpt lat="59.158028" lon="5.868011">
<ele>0</ele>
<time>2007-05-21T06:01:53Z</time>
</trkpt>
</trkseg>
</trk>
</gpx>
XML;
$xml = simplexml_load_string($string);
// Single simplified attribute retrieval.
foreach($xml->trk->trkseg->trkpt[0]->attributes() as $a => $b) {
echo $a,'="',$b,"\"\n";
}
// Iterative attribute retrieval.
// Iterates over all instances of trkpt
foreach($xml->trk->trkseg->trkpt as $a => $b) {
// iterates over all trkpt attributes
foreach($b->attributes() as $a => $b) {
//Sample lat print
print '<br />';
//Sample interative print
echo $a,'="',$b,"\"\n";
}
}
?>
这给出了以下输出
lat="59.158021" lon="5.868032"
lat="59.158021"
lon="5.868032"
lat="59.158028"
lon="5.868011"
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我来说两句