需要使用 php foreach 使用第二个 XML 创建 XML 元素和属性

Question

我有一个 XML 文档 (traffic.xml)，然后我使用 PHP 使用 foreach 仅提取 2 个特定属性，因为原始 XML 中有大量属性来创建 PHP(drivetimeFetch.php)。

我现在需要做的是，使用drivetimeFetch.php，我需要创建另一个xml 文档（carousel_Traffic.xml），其中的元素和属性由我创建的剥离drivetimeFetch.php 中的大约30 行组成。这是我卡住的地方。我能够编写元素和属性，但是如何将每一行放入自己的元素块中。

这是我的 php 的样子：

<?php
$xml1 = new SimpleXMLElement(file_get_contents('https://wsidata.weather.com/201303/en-us/55828880/traffic.xml'));
foreach ($xml1->drivetimes->drivetime as $drivetime) {
    echo"<br>";
    echo $drivetime['pathName'].":"." ".$drivetime['driveTimeMinutes']."min \n" ;
}
$xml_txt = '<?xml version="1.0" encoding="UTF-8"?>'."\r\n".'<tickerfeed version="2.4">'."\r\n". 
           '<playlist type="scrolling_carousel" name="TrafficScroll" target="carousel">'."\r\n" ;
$element = '<element>';
$elementClose = '</element>';
$field1 = '<field name="05">';           
$fieldClose = '</field>';
$playlistClose = '</playlist>';
$tickerfeedClose = '</tickerfeed>';

$f = fopen("C:\\Users\\Administrator\\Desktop\\carousel_Traffic.xml", "w"); 
fwrite ($f, $xml_txt. "\r\n" );
fwrite ($f, $element. "\r\n" );
fwrite ($f, $field1. $drivetime['pathName'].":"." ".$drivetime['driveTimeMinutes']."min " . $fieldClose. "\r\n" );
fwrite ($f, $elementClose. "\r\n" );
fwrite ($f, $playlistClose. "\r\n" );
fwrite ($f, $tickerfeedClose. "\r\n" );
fclose ($f);
?>

我需要的是让 carousel_Traffic.xml 看起来像这样：

<?xml version="1.0" encoding="UTF-8"?>
<tickerfeed version="2.4">
<playlist type="scrolling_carousel" name="TrafficScroll" target="carousel">

<element>
<field name="05">I-278: Bklyn Battery Tunnel to Brooklyn Bridge: 10min </field>
</element>
</playlist>
</tickerfeed>

对于drivetimeFetch.php 中的每一行，我猜这是一个foreach 操作，但我不知道如何做到这一点，以便每一行的pathName 和driveTimeMinutes 都有自己的元素堵塞。如您所见，我让它只适用于一行。

Answer 1

考虑 XSLT 将输入 XML 转换为最终输出。不需要 XML 文档的循环或字符串连接：

// LOAD XML SOURCE
$xml1 = new SimpleXMLElement(file_get_contents('https://wsidata.weather.com/201303/en-us/55828880/traffic.xml'));

// XSLT STRING
$xslstr = '<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
             <xsl:output version="1.0" encoding="UTF-8" method="xml" indent="yes" />
             <xsl:strip-space elements="*"/>

              <xsl:template match="node()|@*">
                <xsl:copy>
                  <xsl:apply-templates select="node()|@*" />
                </xsl:copy>
              </xsl:template>

              <xsl:template match="traffic">
                  <tickerfeed version="2.4">
                      <playlist type="scrolling_carousel" name="TrafficScroll" target="carousel">            
                          <xsl:apply-templates select="drivetimes" />
                      </playlist>
                  </tickerfeed>
              </xsl:template>

              <xsl:template match="incidents"/>

              <xsl:template match="drivetimes">
                  <element>
                      <template>Traffic</template>
                      <xsl:apply-templates select="drivetime"/>
                  </element>
              </xsl:template>

              <xsl:template match="drivetime">
                  <field name="05"><xsl:value-of select="concat(@pathName, \': \', @driveTimeMinutes, \'min\')"/></field>
              </xsl:template>

           </xsl:stylesheet>';

$xslfile = new SimpleXMLElement($xslstr);

// TRANSFORM XML with XSLT
$proc = new XSLTProcessor;
$proc->importStyleSheet($xslfile); 
$newXML = $proc->transformToXML($xml1);

// OUTPUT TO FILE
file_put_contents('C:\\Users\\Administrator\\Desktop\\carousel_Traffic.xml', $newXML);

输出

<?xml version="1.0" encoding="UTF-8"?>
<tickerfeed version="2.4">
  <playlist type="scrolling_carousel" name="TrafficScroll" target="carousel">
    <element>
      <template>Traffic</template>
      <field name="05">I-95: Bruckner Interchange to I-95 Northbound - Midland Ave/Exit 22: 22min</field>
    </element>
    <element>
      <template>Traffic</template>
      <field name="05">Belt Pkwy: Verrazano Brg to Southern State Pkwy E Eastbound - Nassau/Queens County Line: 62min</field>
    </element>
    <element>
      <template>Traffic</template>
      <field name="05">I-95 Northbound - Alexander Hamilton Brg to Bruckner Interchange: 14min</field>
    </element>
    <element>
      <template>Traffic</template>
      <field name="05">Bronx River Pkwy:  Cross County Pkwy to Bruckner Expressway: 37min</field>
    </element>
    <element>
      <template>Traffic</template>
      <field name="05">I-278: Verrazano to Belt Merge: 3min</field>
    </element>
    <element>
      <template>Traffic</template>
      <field name="05">Belt Pkwy: Southern State Pkwy to Van Wyck Expwy: 8min</field>
    </element>
    <element>
      <template>Traffic</template>
      <field name="05">Belt Pkwy: Ocean Pkwy to Verrazano Brg: 9min</field>
    </element>
    <element>
      <template>Traffic</template>
      <field name="05">Verrazano Brg to Brooklyn Brg: 2min</field>
    </element>
    <element>
      <template>Traffic</template>
      <field name="05">NYS Thruway: I-287 to Tappan Zee Bridge Tolls: 17min</field>
    </element>
    <element>
      <template>Traffic</template>
      <field name="05">Major Deegan Expwy: Macombs Dam Brg to Third Ave Bridge: 2min</field>
    </element>
    <element>
...

Answer 2

我明白了！玩了一圈之后，我明白了。这是我的工作代码：

<?php
$xml1 = new SimpleXMLElement(file_get_contents('https://wsidata.weather.com/201303/en-us/55828880/traffic.xml'));
foreach ($xml1->drivetimes->drivetime as $drivetime) {
    echo"<br>";
    echo $drivetime['pathName'].":"." ".$drivetime['driveTimeMinutes']."min \n" ;
}
$xml_txt = '<?xml version="1.0" encoding="UTF-8"?>'."\r\n".'<tickerfeed version="2.4">'."\r\n". 
           '<playlist type="scrolling_carousel" name="TrafficScrollIN" target="carousel">'."\r\n" ;
$element = '<element>';
$elementClose = '</element>';
$field1 = '<field name="05">';           
$fieldClose = '</field>';
$playlistClose = '</playlist>';
$tickerfeedClose = '</tickerfeed>';
$template = '<template>';
$templateClose = '</template>';

$f = fopen("C:\\Users\\Administrator\\Desktop\\PIX_Traffic.xml", "w"); 

fwrite ($f, $xml_txt. "\r\n" );
foreach ($xml1->drivetimes->drivetime as $drivetime){
fwrite ($f, $element. "\r\n" );
fwrite ($f, $template. "Traffic" . $templateClose. "\r\n" );
fwrite ($f, $field1. $drivetime['pathName'].":"." ".$drivetime['driveTimeMinutes']."min " . $fieldClose. "\r\n" );
fwrite ($f, $elementClose. "\r\n" );
}
fwrite ($f, $playlistClose. "\r\n" );
fwrite ($f, $tickerfeedClose. "\r\n" );
fclose ($f);
?>

这是输出：

<?xml version="1.0" encoding="UTF-8"?>
<tickerfeed version="2.4">
<playlist type="scrolling_carousel" name="TrafficScrollIN" target="carousel">

<element>
<template>Traffic</template>
<field name="05">Williamsburg Brg to Long Island Expwy: 11min </field>
</element>
<element>
<template>Traffic</template>
<field name="05">I-278: Bklyn Battery Tunnel to Brooklyn Bridge: 4min </field>
</element>
<element>
<template>Traffic</template>
<field name="05">Major Deegan Expwy: Third Ave Bridge to Major Deegan Expwy Southbound - I-278/Bruckner Expy: 3min </field>
</element>
</playlist>
</tickerfeed>