PHP - 解析具有命名空间元素

时间：2018-01-25 00:58:27

标签： php xml parsing xml-namespaces

我阅读了其他帖子和解决方案，但它们对我不起作用 - 或许我对它们的理解不够好。

我有一个hp网络扫描程序，并且有一个perl脚本，它通过一系列事务进行交互，以便我可以启动扫描。我正在努力将其直接移植到php;更适合我想要运行它的服务器。有些交易有效，有些则没有。这是一个没有的。

我从其中一个查询中获取了XML，但它无法成功解析（或者这是我不太了解的地方）。我正在运行php 7.1.12版，以防有相关内容。

我的测试输出：

> php xmltest.php
SimpleXMLElement Object
(
)
object(SimpleXMLElement)#1 (0) {
}
>

如果xml更简单（我认为没有名称空间信息），那么print_r（）非常详细。

这是完整的测试脚本，其中包含一些要处理的实际数据      

error_reporting( E_ALL );
ini_set('display_errors', 1);

$test_1 = <<<EOM
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope 
    xmlns:SOAP-ENV="http://www.w3.org/2003/05/soap-envelope"
    xmlns:SOAP-ENC="http://www.w3.org/2003/05/soap-encoding"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing"
    xmlns:wst="http://schemas.xmlsoap.org/ws/2004/09/transfer"
    xmlns:mex="http://schemas.xmlsoap.org/ws/2004/09/mex"
    xmlns:wsdp="http://schemas.xmlsoap.org/ws/2006/02/devprof"
    xmlns:PNPX="http://schemas.microsoft.com/windows/pnpx/2005/10"
    xmlns:UNS1="http://www.microsoft.com/windows/test/testdevice/11/2005"
    xmlns:dd="http://www.hp.com/schemas/imaging/con/dictionaries/1.0"
    xmlns:wprt="http://schemas.microsoft.com/windows/2006/08/wdp/print"
    xmlns:wscn="http://schemas.microsoft.com/windows/2006/08/wdp/scan">
    <SOAP-ENV:Header>
        <wsa:To>http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</wsa:To>
        <wsa:Action>http://schemas.xmlsoap.org/ws/2004/09/transfer/GetResponse</wsa:Action>
        <wsa:MessageID>urn:uuid:fec6e42d-5356-1f69-9c3a-001f2927cf33</wsa:MessageID>
        <wsa:RelatesTo>urn:uuid:704ccde5-6861-415d-bd65-31dd9d7a8b98</wsa:RelatesTo>
    </SOAP-ENV:Header>
    <SOAP-ENV:Body>
        <mex:Metadata>
            <mex:MetadataSection Dialect="http://schemas.xmlsoap.org/ws/2006/02/devprof/ThisDevice">
                <wsdp:ThisDevice>
                    <wsdp:FriendlyName xml:lang="en">Printer (HP Color LaserJet CM1312nfi MFP)</wsdp:FriendlyName>
                    <wsdp:FirmwareVersion>20140625</wsdp:FirmwareVersion>
                    <wsdp:SerialNumber>CNB885H665</wsdp:SerialNumber>
                </wsdp:ThisDevice>
            </mex:MetadataSection>
            <mex:MetadataSection Dialect="http://schemas.xmlsoap.org/ws/2006/02/devprof/ThisModel">
                <wsdp:ThisModel>
                    <wsdp:Manufacturer xml:lang="en">HP</wsdp:Manufacturer>
                    <wsdp:ManufacturerUrl>http://www.hp.com/</wsdp:ManufacturerUrl>
                    <wsdp:ModelName xml:lang="en">HP Color LaserJet CM1312nfi MFP</wsdp:ModelName>
                    <wsdp:ModelNumber>CM1312nfi MFP</wsdp:ModelNumber>
                    <wsdp:PresentationUrl>http://192.168.1.20:80/</wsdp:PresentationUrl>
                    <PNPX:DeviceCategory>Printers</PNPX:DeviceCategory>
                </wsdp:ThisModel>
            </mex:MetadataSection>
            <mex:MetadataSection Dialect="http://schemas.xmlsoap.org/ws/2006/02/devprof/Relationship">
                <wsdp:Relationship Type="http://schemas.xmlsoap.org/ws/2006/02/devprof/host">
                    <wsdp:Hosted>
                        <wsa:EndpointReference>
                            <wsa:Address>http://192.168.1.20:3910/</wsa:Address>
                            <wsa:ReferenceProperties>
                                <UNS1:ServiceIdentifier>uri:prn</UNS1:ServiceIdentifier>
                            </wsa:ReferenceProperties>
                        </wsa:EndpointReference>
                        <wsdp:Types>wprt:PrinterServiceType</wsdp:Types>
                        <wsdp:ServiceId>uri:1cd4F16e-7c8a-a7a0-3797-00145a8827ce</wsdp:ServiceId>
                        <PNPX:CompatibleId>http://schemas.microsoft.com/windows/2006/08/wdp/print/PrinterServiceType</PNPX:CompatibleId>
                    </wsdp:Hosted>
                </wsdp:Relationship>
            </mex:MetadataSection>
        </mex:Metadata>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>
EOM;

$myxml1 = simplexml_load_string($test_1);
print_r($myxml1);
var_dump($myxml1);
exit;
?>

我想要拉出几个参数。例如，一个是：

<wsa:Address>http://192.168.1.20:3910/</wsa:Address>

您能否帮助我缩小关于如何访问此参数的知识空白？

谢谢！

2 个答案:

答案 0 :(得分：1)

首先，soap和名称空间只会让解析XML变得比以前更难。我从未解析过具有名称空间的XML，这些名称空间实际上使XML更易于理解，或者根本没有任何好处。我完全明白为什么命名空间存在，但它只是意味着跳过一些额外的环节来获取数据。命名空间的技巧是你必须输入＆＃34;通过将命名空间作为子进程请求到命名空间分支。

<?php

error_reporting( E_ALL );
ini_set('display_errors', 1);

$str = <<<EOM
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope 
    xmlns:SOAP-ENV="http://www.w3.org/2003/05/soap-envelope"
    xmlns:SOAP-ENC="http://www.w3.org/2003/05/soap-encoding"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing"
    xmlns:wst="http://schemas.xmlsoap.org/ws/2004/09/transfer"
    xmlns:mex="http://schemas.xmlsoap.org/ws/2004/09/mex"
    xmlns:wsdp="http://schemas.xmlsoap.org/ws/2006/02/devprof"
    xmlns:PNPX="http://schemas.microsoft.com/windows/pnpx/2005/10"
    xmlns:UNS1="http://www.microsoft.com/windows/test/testdevice/11/2005"
    xmlns:dd="http://www.hp.com/schemas/imaging/con/dictionaries/1.0"
    xmlns:wprt="http://schemas.microsoft.com/windows/2006/08/wdp/print"
    xmlns:wscn="http://schemas.microsoft.com/windows/2006/08/wdp/scan">
    <SOAP-ENV:Header>
        <wsa:To>http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</wsa:To>
        <wsa:Action>http://schemas.xmlsoap.org/ws/2004/09/transfer/GetResponse</wsa:Action>
        <wsa:MessageID>urn:uuid:fec6e42d-5356-1f69-9c3a-001f2927cf33</wsa:MessageID>
        <wsa:RelatesTo>urn:uuid:704ccde5-6861-415d-bd65-31dd9d7a8b98</wsa:RelatesTo>
    </SOAP-ENV:Header>
    <SOAP-ENV:Body>
        <mex:Metadata>
            <mex:MetadataSection Dialect="http://schemas.xmlsoap.org/ws/2006/02/devprof/ThisDevice">
                <wsdp:ThisDevice>
                    <wsdp:FriendlyName xml:lang="en">Printer (HP Color LaserJet CM1312nfi MFP)</wsdp:FriendlyName>
                    <wsdp:FirmwareVersion>20140625</wsdp:FirmwareVersion>
                    <wsdp:SerialNumber>CNB885H665</wsdp:SerialNumber>
                </wsdp:ThisDevice>
            </mex:MetadataSection>
            <mex:MetadataSection Dialect="http://schemas.xmlsoap.org/ws/2006/02/devprof/ThisModel">
                <wsdp:ThisModel>
                    <wsdp:Manufacturer xml:lang="en">HP</wsdp:Manufacturer>
                    <wsdp:ManufacturerUrl>http://www.hp.com/</wsdp:ManufacturerUrl>
                    <wsdp:ModelName xml:lang="en">HP Color LaserJet CM1312nfi MFP</wsdp:ModelName>
                    <wsdp:ModelNumber>CM1312nfi MFP</wsdp:ModelNumber>
                    <wsdp:PresentationUrl>http://192.168.1.20:80/</wsdp:PresentationUrl>
                    <PNPX:DeviceCategory>Printers</PNPX:DeviceCategory>
                </wsdp:ThisModel>
            </mex:MetadataSection>
            <mex:MetadataSection Dialect="http://schemas.xmlsoap.org/ws/2006/02/devprof/Relationship">
                <wsdp:Relationship Type="http://schemas.xmlsoap.org/ws/2006/02/devprof/host">
                    <wsdp:Hosted>
                        <wsa:EndpointReference>
                            <wsa:Address>http://192.168.1.20:3910/</wsa:Address>
                            <wsa:ReferenceProperties>
                                <UNS1:ServiceIdentifier>uri:prn</UNS1:ServiceIdentifier>
                            </wsa:ReferenceProperties>
                        </wsa:EndpointReference>
                        <wsdp:Types>wprt:PrinterServiceType</wsdp:Types>
                        <wsdp:ServiceId>uri:1cd4F16e-7c8a-a7a0-3797-00145a8827ce</wsdp:ServiceId>
                        <PNPX:CompatibleId>http://schemas.microsoft.com/windows/2006/08/wdp/print/PrinterServiceType</PNPX:CompatibleId>
                    </wsdp:Hosted>
                </wsdp:Relationship>
            </mex:MetadataSection>
        </mex:Metadata>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>
EOM;

$xml = simplexml_load_string($str);

$namespaces = $xml->getNamespaces(true);

// Here we are saying that we want the Body node in the SOAP-ENV namespace
$body = $xml->children( $namespaces['SOAP-ENV'] )->Body;

// Inside that Body node, we want to get into the mex namespace
$mex = $body->children( $namespaces['mex'] );

// We want the MetadataSections that are in each of the mex namespaces
$metadataSections = $mex->Metadata->MetadataSection;

// Loop through each of the MetadataSections
foreach( $metadataSections as $meta )
{
    // Get inside the wsdp namespace
    $wsdp = $meta->children( $namespaces['wsdp'] );

    // Check if there is a Hosted node inside a Relationship node
    if( isset( $wsdp->Relationship->Hosted ) )
    {
        // Get the wsa namespace inside the Hosted node
        $wsa = $wsdp->Relationship->Hosted->children( $namespaces['wsa'] );

        // If there is an Address inside the EndpointReference node
        if( isset( $wsa->EndpointReference->Address ) )
        {
            // Then output it
            echo $wsa->EndpointReference->Address;
        }
    }
}

答案 1 :(得分：0)

作为一个非常简单的例子 - 如果你只想要wsa:Address元素...... 

$myxml1 = simplexml_load_string($test_1);
$myxml1->registerXPathNamespace("wsa", "http://schemas.xmlsoap.org/ws/2004/08/addressing");
echo "wsa:Address=".(string)$myxml1->xpath("//wsa:Address")[0];

这只是确保wsa命名空间已在文档中注册并可用于XPath表达式。然后XPath表达式只是说 - 从文档中的任何位置获取元素wsa:Address。但是当xpath返回所有匹配的列表（即使只有1）时，请使用[0]来获取第一个项目。这输出...... 

wsa:Address=http://192.168.1.20:3910/

如果你需要更多关于（例如）<wsdp:Hosted>元素的数据，你可以做类似...... 

$myxml1 = simplexml_load_string($test_1);
$myxml1->registerXPathNamespace("wsdp", "http://schemas.xmlsoap.org/ws/2006/02/devprof");
$hosted = $myxml1->xpath("//wsdp:Hosted")[0];
$hostedWSA = $hosted->children("wsa", true);
echo "wsa:Address=".(string)$hostedWSA->EndpointReference->Address.PHP_EOL;
$hostedWSPD = $hosted->children("wsdp", true);
echo "wsdp:Types=".(string)$hostedWSPD->Types.PHP_EOL;

所以相反，这是通过获取正确的元素然后使用该节点内不同命名空间中的各种子节点来开始的。

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