使用 xpath 和 xpathnamespace 的 simplexml 查找节点的值 - 未定义的偏移量:0
simplexml finding value of node using xpath with xpathnamespace - undefined offset: 0
我是 PHP simplexml 代码的新手,我发现该代码确实为变量 $xml_record_congrant_funded 提供了结果。
我尝试添加名称空间标识符(请参阅注释掉的代码),但没有结果 - returns "Undefined offset: 0"。
是否需要对名称空间标识符进行某种修改?
感谢任何线索。
PHP 文件:
$url_congrant_file = "test.xml";
$xml_congrant_feed = simplexml_load_file($url_congrant_file);
$xml_congrant_feed->registerXPathNamespace('a','http://www.digitalmeasures.com/schema/data');//
$xml_congrant_feed->registerXPathNamespace('dmd','http://www.digitalmeasures.com/schema/data-metadata');
$username="bill-smith";
$username=strtolower($username);
$xml_record=$xml_congrant_feed->xpath('//a:Record[contains(translate(@username,"ABCDEFGHIJKLMNOPQRSTUVWXYZ","abcdefghijklmnopqrstuvwxyz"),"'.$username.'")]');
echo '<br>$xml_record[0] is...'.$xml_record[0]['username'];
$xml_record_congrant_funded = $xml_record[0]->xpath('CONGRANT[STATUS="Funded"]');
//$xml_record_congrant_funded = $xml_record[0]->xpath('./dmd:CONGRANT[STATUS="Funded"]');
//this needs to store all 'congrant' nodes with the status of "funded"
echo '<br>$xml_record_congrant_funded[0] is...'.$xml_record_congrant_funded[0]->status;
//this needs to display the value of the 'status' node
//I've put in the actual constants for the $offset (0), $per_page (2)
for ($i = 0; $i < (0 + 2); $i++) {
echo '<br>$i is...'.$i;
$strCongrant_id = $xml_record_congrant_funded[$i]->ident;
echo '<br>$strCongrant_id...'.$strCongrant_id;
$strCongrant_status = $xml_record_congrant_funded[$i]->status;
echo '<br>$strCongrant_id...'.$strCongrant_status;
//this yields no results
}
var_dump($xml_record_congrant_funded);
print_r($xml_record_congrant_funded);
XML 文件:
<?xml version="1.0" encoding="utf-8"?>
<Data xmlns="http://www.digitalmeasures.com/schema/data" xmlns:dmd="http://www.digitalmeasures.com/schema/data-metadata" dmd:date="2019-09-09">
<Record userId="9a" username="bill-smith" termId="2" dmd:surveyId="1">
<dmd:IndexEntry indexKey="DE" entryKey="S7" text="S7"/>
<CONGRANT id="12" dmd:originalSource="MA" dmd:created="2018-03-30T14:22:43" dmd:lastModifiedSource="MA" dmd:lastModified="2019-02-19T10:49:07" dmd:startDate="2017-08-08" dmd:endDate="2022-07-31">
<TYPE>Book Grant</TYPE>
<TITLE>Modulation Theory</TITLE>
<STATUS>Funded</STATUS>
</CONGRANT>
<CONGRANT id="11" dmd:originalSource="MA" dmd:created="2019-07-05T10:14:55" dmd:lastModifiedSource="MA" dmd:lastModified="2019-07-05T10:17:44" dmd:startDate="2019-06-15" dmd:endDate="2019-06-15">
<TYPE>Digital Grant</TYPE>
<TITLE>Frequency Modulation</TITLE>
<STATUS/>
</CONGRANT>
<CONGRANT id="16" dmd:originalSource="MA" dmd:created="2018-03-26T11:39:42" dmd:lastModifiedSource="MA" dmd:lastModified="2018-03-26T11:40:15" dmd:startDate="2017-10-04" dmd:endDate="2017-10-04">
<TYPE>Book Grant</TYPE>
<TITLE>Ferrite Curves</TITLE>
<STATUS>Currently Under Review</STATUS>
</CONGRANT>
</Record>
</Data>
当您在 SimpleXML 中的单个节点上使用 XPath 时,您必须在每次要使用它时注册名称空间,并且由于所有节点都在默认名称空间中(您有在你的代码中使用 a
作为前缀)你需要继续添加它。
因此在第二个 XPath 中,您需要在 $xml_record[0]
上注册相同的名称空间,然后将其用作表达式 'a:CONGRANT[a:STATUS="Funded"]'
...
中的前缀
$xml_record[0]->registerXPathNamespace('a','http://www.digitalmeasures.com/schema/data');//
$xml_record_congrant_funded = $xml_record[0]->xpath('a:CONGRANT[a:STATUS="Funded"]');
echo '<br>$xml_record_congrant_funded[0] is...'.$xml_record_congrant_funded[0]->STATUS;
另请注意,您需要对对象元素使用与 XML 中相同的大小写 - 所以它是 $xml_record_congrant_funded[0]->STATUS
.
我是 PHP simplexml 代码的新手,我发现该代码确实为变量 $xml_record_congrant_funded 提供了结果。
我尝试添加名称空间标识符(请参阅注释掉的代码),但没有结果 - returns "Undefined offset: 0"。
是否需要对名称空间标识符进行某种修改? 感谢任何线索。
PHP 文件:
$url_congrant_file = "test.xml";
$xml_congrant_feed = simplexml_load_file($url_congrant_file);
$xml_congrant_feed->registerXPathNamespace('a','http://www.digitalmeasures.com/schema/data');//
$xml_congrant_feed->registerXPathNamespace('dmd','http://www.digitalmeasures.com/schema/data-metadata');
$username="bill-smith";
$username=strtolower($username);
$xml_record=$xml_congrant_feed->xpath('//a:Record[contains(translate(@username,"ABCDEFGHIJKLMNOPQRSTUVWXYZ","abcdefghijklmnopqrstuvwxyz"),"'.$username.'")]');
echo '<br>$xml_record[0] is...'.$xml_record[0]['username'];
$xml_record_congrant_funded = $xml_record[0]->xpath('CONGRANT[STATUS="Funded"]');
//$xml_record_congrant_funded = $xml_record[0]->xpath('./dmd:CONGRANT[STATUS="Funded"]');
//this needs to store all 'congrant' nodes with the status of "funded"
echo '<br>$xml_record_congrant_funded[0] is...'.$xml_record_congrant_funded[0]->status;
//this needs to display the value of the 'status' node
//I've put in the actual constants for the $offset (0), $per_page (2)
for ($i = 0; $i < (0 + 2); $i++) {
echo '<br>$i is...'.$i;
$strCongrant_id = $xml_record_congrant_funded[$i]->ident;
echo '<br>$strCongrant_id...'.$strCongrant_id;
$strCongrant_status = $xml_record_congrant_funded[$i]->status;
echo '<br>$strCongrant_id...'.$strCongrant_status;
//this yields no results
}
var_dump($xml_record_congrant_funded);
print_r($xml_record_congrant_funded);
XML 文件:
<?xml version="1.0" encoding="utf-8"?>
<Data xmlns="http://www.digitalmeasures.com/schema/data" xmlns:dmd="http://www.digitalmeasures.com/schema/data-metadata" dmd:date="2019-09-09">
<Record userId="9a" username="bill-smith" termId="2" dmd:surveyId="1">
<dmd:IndexEntry indexKey="DE" entryKey="S7" text="S7"/>
<CONGRANT id="12" dmd:originalSource="MA" dmd:created="2018-03-30T14:22:43" dmd:lastModifiedSource="MA" dmd:lastModified="2019-02-19T10:49:07" dmd:startDate="2017-08-08" dmd:endDate="2022-07-31">
<TYPE>Book Grant</TYPE>
<TITLE>Modulation Theory</TITLE>
<STATUS>Funded</STATUS>
</CONGRANT>
<CONGRANT id="11" dmd:originalSource="MA" dmd:created="2019-07-05T10:14:55" dmd:lastModifiedSource="MA" dmd:lastModified="2019-07-05T10:17:44" dmd:startDate="2019-06-15" dmd:endDate="2019-06-15">
<TYPE>Digital Grant</TYPE>
<TITLE>Frequency Modulation</TITLE>
<STATUS/>
</CONGRANT>
<CONGRANT id="16" dmd:originalSource="MA" dmd:created="2018-03-26T11:39:42" dmd:lastModifiedSource="MA" dmd:lastModified="2018-03-26T11:40:15" dmd:startDate="2017-10-04" dmd:endDate="2017-10-04">
<TYPE>Book Grant</TYPE>
<TITLE>Ferrite Curves</TITLE>
<STATUS>Currently Under Review</STATUS>
</CONGRANT>
</Record>
</Data>
当您在 SimpleXML 中的单个节点上使用 XPath 时,您必须在每次要使用它时注册名称空间,并且由于所有节点都在默认名称空间中(您有在你的代码中使用 a
作为前缀)你需要继续添加它。
因此在第二个 XPath 中,您需要在 $xml_record[0]
上注册相同的名称空间,然后将其用作表达式 'a:CONGRANT[a:STATUS="Funded"]'
...
$xml_record[0]->registerXPathNamespace('a','http://www.digitalmeasures.com/schema/data');//
$xml_record_congrant_funded = $xml_record[0]->xpath('a:CONGRANT[a:STATUS="Funded"]');
echo '<br>$xml_record_congrant_funded[0] is...'.$xml_record_congrant_funded[0]->STATUS;
另请注意,您需要对对象元素使用与 XML 中相同的大小写 - 所以它是 $xml_record_congrant_funded[0]->STATUS
.