解析使用DOM

Question

PHP我想解析和提取例如一個XML文件信息我想提取下列事情複雜的XML文件：

• uio，從報頭batchId和creationDate

• 所有accountToken，Id，setId，Amount等從身體

• batchCount和TotalAmount從頁腳

這是我的XML文件：

<?xml version="1.0" encoding="UTF-8"?> 
<c:Instructions xmlns:c="http://www.localhost.com/platform"> 
    <c:Header uio="a881-aa05-1231391408a2" batchId="c7-8ef6-eb81b345e736" creationDate="2014-08-10T00:00:00.000Z" /> 
    <c:Instructions accountToken="0001578066518896635248066746078163233357907196" Id="4178- a6dd-d1459cda71c3" setId="132530196846" Amount="27.00" Description="GoulSalons and Spas" Timestamp="2014-08-10T05:37:56.000Z" TransactionId="1324300196883" TransactionTimestamp="2014-08-07T18:32:30.000Z" merchant="1307" consumer="1_4f13eb-4efb-b450- ca747763fbc4" store="363" campaign="Partner, Parnd Spas, Partner, Pilot, 5/30/14" /> 
    <c:Instructions accountToken="000227229359641325887385737985006" Id="-08eb-43dd-884b-ccae980372f8" setId="2271109667569" Amount="12.24" Description="Pyro's Pi" Timestamp="2014-08-10T03:00:05.000Z" TransactionId="291153267592" TransactionTimestamp="2014-08-07T00:00:00.000Z" merchant="13" consumer="0d3-4ef3-8922-932f0d860012" store="31" campaign=" Challenge Pyro&amp;#39;s Partner, Pilot, 4/4/14" /> 
    <c:Instructions accountToken="0002108430726669005078952425" Id="bf48-4f86-84f6-df69432ef65b" setId="1211100232621" Amount="26.95" Description="Blue" Timestamp="2014-08-10T05:37:20.000Z" TransactionId="121030232642" TransactionTimestamp="2014-08-07T17:48:29.000Z" merchant="104880" consumer="2-4d32-a2b4-f0b54a8e50b5" store="39" campaign="Partner Challenge Blue Fin, Pilot, 5/30/14" /> 
    <c:Instructions accountToken="000341863769868297728447318744937673" Id="bf48-4f86-84f6-df69432ef65b" setId="1260320211819" Amount="52.00" Description="Fin" Timestamp="2014-08-10T05:37:41.000Z" TransactionId="1259211836" TransactionTimestamp="2014-08-08T02:41:47.000Z" merchant="180" consumer="6be4-46cd-95b8-244ab78c50ce" store="52" campaign="Partner Challenge Blue Fin, Partner, Pilot, 5/30/14" /> 
    <c:Instructions accountToken="000521692104031759552776822005" Id="42f0-4850-9e33-54e7d79927d9" setId="29126329667269" Amount="17.00" Description=" Bear" Timestamp="2014-08-10T03:00:05.000Z" TransactionId="291259667289" TransactionTimestamp="2014-08-08T00:00:00.000Z" merchant="137" consumer="71bb-46d2-8e42-c9798d7dd0d7" store="39" campaign="Partner Challenge Blind Bear, Partner, Pilot, 5/22/14" /> 
    <c:Instructions accountToken="0005216177101271759552776822005" Id="42f0-4850-9e33-54e7d79927d9" setId="29134327117182" Amount="9.00" Description="Bear" Timestamp="2014-08-10T03:00:05.000Z" TransactionId="29124667297" TransactionTimestamp="2014-08-08T00:00:00.000Z" merchant="132" consumer="71bb-46d2-8e42-c9798d7dd0d7" store="398" campaign=" Bear, Partner, Pilot, 5" /> 
    <c:Footer batchCount="6" totalAmount="144" /> 
</c:Instructions> 

所以，我寫了這個代碼，至少檢索AccountToken和Id，但我得到一個空白頁：

<?php 
$doc = new DOMDocument; 
$doc->load("sample.xml"); 
$rows = $doc->getElementsByTagNameNS('http://www.localhost.com/platform', 'Instruction'); 
foreach ($rows as $row) { 
$AToken = $row->getAttribute('accountToken'); 
$Id = $row->getAttribute('Id'); 
var_dump($AToken, $Id); 
} 
?> 

但我一直無法從XML文件中獲取任何東西。

Answer 1

您擁有的XML文檔有點奇怪，因爲頂層元素與其直接子元素相同。出於這個原因，我會使用DOMXPath從文檔中檢索你想要的元素（OK，XPaths真棒！）。要使用DOMXPath，您需要創建一個新的DOMXPath對象並註冊名稱空間http://www.localhost.com/platform，以便它可以搜索這些元素。

注意：您的腳本不工作，因爲文檔中沒有Instruction元素 - 它們都是Instructions。 :)

這是一個簡單且易於擴展的腳本，可以將數據從您發佈的文檔中提取出來。它只是打印數據，但你可能會想要做一些更有趣的事情。

$doc = new DOMDocument; 
$doc->load($your_xml_here); 

# create the DOMXPath object 
$xp = new DOMXPath($doc); 
# registers the namespace; to search for nodes in this namespace, prefix them with "c" 
$xp->registerNamespace("c", 'http://www.localhost.com/platform'); 

# search for all c:Header nodes under the top node, c:Instructions 
foreach ($xp->query("/c:Instructions/c:Header") as $h) { 
    # array of attributes to retrieve... 
    foreach (array('uio', 'batchId', 'creationDate') as $ha) { 
     print "header attribute $ha: " . $h->getAttribute($ha) . PHP_EOL; 
    } 
} 

# retrieves c:Instructions nodes that are under the c:Instructions node 
foreach ($xp->query("/c:Instructions/c:Instructions") as $i) { 
    # you can expand the list of attributes here 
    foreach (array("Id", "accountToken") as $ia) { 
     print "Instruction attrib $ia: " . $i->getAttribute($ia) . PHP_EOL; 
    } 
} 

# footer information  
foreach ($xp->query("/c:Instructions/c:Footer") as $f) { 
    foreach (array("batchCount", "totalAmount") as $fa) { 
     print "footer attribute $fa: " . $f->getAttribute($fa) . PHP_EOL; 
    } 
} 

輸出的XML你貼：

header attribute uio: a881-aa05-1231391408a2 
header attribute batchId: c7-8ef6-eb81b345e736 
header attribute creationDate: 2014-08-10T00:00:00.000Z 
Instruction attrib Id: 4178- a6dd-d1459cda71c3 
Instruction attrib accountToken: 0001578066518896635248066746078163233357907196 
Instruction attrib Id: -08eb-43dd-884b-ccae980372f8 
Instruction attrib accountToken: 000227229359641325887385737985006 
Instruction attrib Id: bf48-4f86-84f6-df69432ef65b 
Instruction attrib accountToken: 0002108430726669005078952425 
Instruction attrib Id: bf48-4f86-84f6-df69432ef65b 
Instruction attrib accountToken: 000341863769868297728447318744937673 
Instruction attrib Id: 42f0-4850-9e33-54e7d79927d9 
Instruction attrib accountToken: 000521692104031759552776822005 
Instruction attrib Id: 42f0-4850-9e33-54e7d79927d9 
Instruction attrib accountToken: 0005216177101271759552776822005 
footer attribute batchCount: 6 
footer attribute totalAmount: 144 

附錄：如果你讓所有的屬性，它可能會更快使用運行等效代碼的SimpleXMLElement：

$sxe = new SimpleXMLElement($xml_source); 
$sxe->registerXPathNamespace("c", 'http://www.localhost.com/platform'); 

# e.g. get the header data 
foreach ($sxe->xpath("/c:Instructions/c:Header") as $i) { 
    # iterate through all the element attributes 
    foreach ($i->attributes() as $name => $value) { 
     print "header attribute $name is $value" . PHP_EOL; 
    } 
} 

輸出：

header attribute uio is a881-aa05-1231391408a2 
header attribute batchId is c7-8ef6-eb81b345e736 
header attribute creationDate is 2014-08-10T00:00:00.000Z 

Answer 2

應該是getElementsByTagNameNS調用中的指令而不是指令嗎？