循环包含一些子项和子项的 XML 以在 PHP 中以表格形式输出答案

【问题标题】：Looping XML containing a few child and children to output as a table in PHP循环包含一些子项和子项的 XML 以在 PHP 中以表格形式输出
【发布时间】：2021-04-04 05:31:24
【问题描述】：

<?xml version="1.0" encoding="utf-8"?>
    <Agenda>
        <responseMessage>Success.</responseMessage>
        <jobs>
            <trip>
                <header>
                    <reservation_number>10562</reservation_number>
                    <recipient_first>John</recipient_first>
                    <recipient_middle>H</recipient_middle>
                    <recipient_last>Doe</recipient_last>
                </header>
                <legs>
                    <leg>
                        <trip_id>42390</trip_id>
                        <leg_status>Active</leg_status>
                        <pickup_date>12/24/2020</pickup_date>
                        <pickup_time>0600</pickup_time>
                        <pickup_state>New York</pickup_state>
                        <pickup_country>USA</pickup_country>
                        <dropoff_state>Pennsylvania</dropoff_state>
                        <dropoff_country>USA</dropoff_country>
                    </leg>
                    <leg>
                        <trip_id>42391</trip_id>
                        <leg_status>Canceled</leg_status>
                        <pickup_date>01/02/2021</pickup_date>
                        <pickup_time>1800</pickup_time>
                        <pickup_state>Pennsylvania</pickup_state>
                        <pickup_country>USA</pickup_country>
                        <dropoff_state>New York</dropoff_state>
                        <dropoff_country>USA</dropoff_country>
                    </leg>
                </legs>
                <secondary_services>
                    <service>
                        <service_leg_id>42390</service_leg_id>
                        <service_name>Tolls</service_name>
                        <service_rate>3.00</service_rate>
                        <service_quantity>1</service_quantity>
                    </service>
                    <service>
                        <service_leg_id>42390</service_leg_id>
                        <service_name>addtl.miles</service_name>
                        <service_rate>3.40</service_rate>
                        <service_quantity>25</service_quantity>
                    </service>
                    <service>
                        <service_leg_id>42391</service_leg_id>
                        <service_name>Tolls</service_name>
                        <service_rate>18.00</service_rate>
                        <service_quantity>1</service_quantity>
                    </service>
                    <service>
                        <service_leg_id>42391</service_leg_id>
                        <service_name>addtl.miles</service_name>
                        <service_rate>3.40</service_rate>
                        <service_quantity>29</service_quantity>
                    </service>
                </secondary_services>
            </trip>
            <trip>
                <header>
                    <reservation_number>10575</reservation_number>
                    <recipient_first>Emily</recipient_first>
                    <recipient_middle></recipient_middle>
                    <recipient_last>Santana</recipient_last>
                </header>
                <legs>
                    <leg>
                        <trip_id>64593</trip_id>
                        <leg_status>Active</leg_status>
                        <pickup_date>12/27/2020</pickup_date>
                        <pickup_time>1700</pickup_time>
                        <pickup_state>New York</pickup_state>
                        <pickup_country>USA</pickup_country>
                        <dropoff_state>Connecticut</dropoff_state>
                        <dropoff_country>USA</dropoff_country>
                    </leg>
                    <leg>
                        <trip_id>64594</trip_id>
                        <leg_status>Active</leg_status>
                        <pickup_date>01/04/2021</pickup_date>
                        <pickup_time>1200</pickup_time>
                        <pickup_state>Connecticut</pickup_state>
                        <pickup_country>USA</pickup_country>
                        <dropoff_state>New York</dropoff_state>
                        <dropoff_country>USA</dropoff_country>
                    </leg>
                </legs>
                <secondary_services>
                    <service>
                        <service_leg_id>64593</service_leg_id>
                        <service_name>Tolls</service_name>
                        <service_rate>0.00</service_rate>
                        <service_quantity>0</service_quantity>
                    </service>
                    <service>
                        <service_leg_id>64593</service_leg_id>
                        <service_name>addtl.miles</service_name>
                        <service_rate>3.40</service_rate>
                        <service_quantity>10</service_quantity>
                    </service>
                    <service>
                        <service_leg_id>64594</service_leg_id>
                        <service_name>Tolls</service_name>
                        <service_rate>04.00</service_rate>
                        <service_quantity>1</service_quantity>
                    </service>
                    <service>
                        <service_leg_id>64594</service_leg_id>
                        <service_name>addtl.miles</service_name>
                        <service_rate>3.40</service_rate>
                        <service_quantity>11</service_quantity>
                    </service>
                </secondary_services>
            </trip>
        </jobs>
    </Agenda>

我无法通过 foreach 循环循环输出这样的表。

Reservation ID	Status	Name	Date	Time	PU Location	DO Location	Tolls	Addlt. Miles
10562-42390	Active	John H Doe	12/24/2020	0600	New York, USA	Pennsylvania, USA	3.00	25
10562-42391	Canceled	John H Doe	01/02/2021	1800	Pennsylvania, USA	New York, USA	18.00	29
10575-64593	Active	Emily Santana	12/27/2020	1700	New York, USA	Connecticut, USA	0.00	10
10575-64594	Active	Emily Santana	01/04/2021	1200	Connecticut, USA	New York, USA	4.00	11

我在另一个 foreach 循环中尝试了一个带有键和值的 foreach 循环，但我无法将 service 元素与 leg 元素匹配，因为它们具有独立的循环。

【问题讨论】：

您能否展示进行匹配的代码，因为它可能比提出全新的解决方案更容易修复。

标签： php xml xpath foreach xmldom

【解决方案1】：

考虑XSLT，这是一种专用语言，旨在转换 XML 文件，例如处理所有值的连接和腿 ID 的匹配。如果需要，XSLT 甚至可以转换为 HTML。 PHP 可以使用 DOMDocument 库运行带有 xsl 类的 XSLT 1.0 脚本。

XSLT （另存为.xsl文件，特殊的.xml文件）

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="xml" omit-xml-declaration="yes" indent="yes"/>
    <xsl:strip-space elements="*"/>
    
    <xsl:key name="leg_key" match="leg" use="trip_id" />
    
    <xsl:template match="/Agenda">
        <xsl:copy>
            <xsl:apply-templates select="descendant::leg[generate-id() =
                                                         generate-id(key('leg_key', trip_id)[1])]"/>
        </xsl:copy>
    </xsl:template>
    
    <xsl:template match="leg">
        <xsl:copy>
            <xsl:variable name="curr_leg_id" select="trip_id"/>
            <Reservation_id>
                <xsl:value-of select="concat(ancestor::trip/header/reservation_number, '-', trip_id)"/>
            </Reservation_id>
            <Status><xsl:value-of select="leg_status"/></Status>
            <Name><xsl:value-of select="concat(ancestor::trip/header/recipient_first, ' ', 
                                               ancestor::trip/header/recipient_middle, ' ', 
                                               ancestor::trip/header/recipient_last)"/></Name>
            <Date><xsl:value-of select="pickup_date"/></Date>
            <Time><xsl:value-of select="pickup_time"/></Time>
            <PU_location><xsl:value-of select="concat(pickup_state, ' ', pickup_country)"/></PU_location>
            <DO_location><xsl:value-of select="concat(dropoff_state, ' ', dropoff_country)"/></DO_location>
            <Tolls>
                <xsl:value-of select="ancestor::trip/secondary_services/service[service_leg_id = $curr_leg_id and
                                                                                service_name='Tolls']/service_rate"/>
            </Tolls>
            <Addl>
                <xsl:value-of select="ancestor::trip/secondary_services/service[service_leg_id = $curr_leg_id and
                                                                                service_name='addtl.miles']/service_quantity"/>
            </Addl>
        </xsl:copy>
    </xsl:template>

</xsl:stylesheet>

Online Demo

PHP （使用$new_xml 满足最终最终使用需求）

// LOAD XML
$xml = new DOMDocument('1.0', 'UTF-8');
$xml->load('/path/to/Input.xml');

// LOAD XSLT 
$xsl = new DOMDocument('1.0', 'UTF-8');   
$xsl->load('/path/to/XSLT_Script.xsl');

// INITIALIZE TRANSFORMER
$proc = new XSLTProcessor;
$proc->importStyleSheet($xsl);

// TRANSFORM ORIGINAL DOCUMENT
$new_xml = $proc->transformToDoc($xml);

// ECHO TO SCREEN 
echo $new_xml->saveXML();

// SAVE TO FILE
file_put_contents('/path/to/Output.xml', $new_xml);

【讨论】：

你绝对是山羊?！应用 XSLT 的强大功能来转换 XML 数据提供了无限量的功能（尤其是匹配）。谢谢！
是的！终于有人看到了 XSLT 的强大功能（xslt 线程之外）！编码愉快！
也许不仅仅是新年决心：认识到 XSLT 的力量 - 因此新年快乐 :+)
@Parfait 谢谢！您只需让别人看到 XSLT ?