从子元素中的XML获取自定义属性

I have the following XML:

<?xml version="1.0" encoding="UTF-8"?>
<Entries>
<Category name="Gallery Wrap">
<Entry>
  <Status>Active</Status>
  <ProductId>12x18_12framewrapwalnut</ProductId>
  <Size>
    <Height>12</Height>
    <Width>18</Width>
    <Depth>12</Depth>
  </Size>
  <Options>
    <Frame cost="86" id="12x18_12framewrapwalnut">Canvas</Frame>
  </Options>
  <Description>12x18 Walnut Framed Gallery Wrap</Description>
  <Weight>.1</Weight>
</Entry>
....
</Category>
</Entries>

I am trying to get the custom attributes for the element. Here is my PHP code so far:

$products = simplexml_load_file( 'product_list.xml' );

foreach ( $products as $category ) {
    $attributes = $category->attributes();
    echo '<h2>' . $attributes['name'] . '</h2>';

    echo '<table>';
    echo '<tr><th></th><th>Name</th><th>Your Cost</th><th>Set Price</th></tr>';

    foreach ( $category->Entry as $product ) {
        foreach ( $product->Options as $option ) {
            $option_attributes = $option->attributes();
            $option_vars = get_object_vars( $option );
            foreach ( $option_vars as $option_name => $option_value ) {
                echo '<tr><td><input type="checkbox" value="' . $option_attributes->id . '" /></td><td>' . $product->Description . ' - ' . $option_name . '</td><td>' . $option_attributes->cost . '</td><td><input type="text" size="5" value="' . $option_attributes->cost . '" data-cost="' . $option_attributes->cost . '" class="price" /></td></tr>';
            }
        }
    }
    echo '</table>';
}

I am building a form that takes this XML data let's users which products they want to include, setting their own price (all that aspect I can deal with later, just can't extract that "cost" and "id" attributes).

Consider an XSLT solution to transform your XML source to HTML. Here, you avoid any foreach loop. Below runs XSLT as an embedded string but can also be loaded from file like any other well-formed XML file. Be sure to enable the XSLT extension in php .ini file: extension=php_xsl.dll/php_xsl.so.

// Load XML source
$xml = new DOMDocument('1.0', 'UTF-8');
$xml->formatOutput = true;
$xml->preserveWhiteSpace = false;
$xml->load('Input.xml');

// Load XSLT string
$xsl = new DOMDocument;
$xslstr = '<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
            <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"
                        omit-xml-declaration="yes"/>

            <xsl:template match="Entries">
                <html>
                    <xsl:apply-templates select="Category"/>
                </html>
            </xsl:template>

            <xsl:template match="Category">
                <h2><xsl:value-of select="@name"/></h2>
                <table>
                    <tr><th></th><th>Name</th><th>Description</th><th>Set-Price</th></tr>
                    <tr><xsl:apply-templates select="Entry"/></tr>
                </table>
            </xsl:template>

            <xsl:template match="Entry">                
                <td><input type="checkbox">
                    <xsl:attribute name="value"><xsl:value-of select="Options/Frame/@id"/></xsl:attribute>
                </input></td>
                <td><xsl:value-of select="Description"/>-<xsl:value-of select="ancestor::Category/@name"/></td>
                <td><xsl:value-of select="Options/Frame/@cost"/></td>
                <td>
                    <input type="text" size="5">
                        <xsl:attribute name="value"><xsl:value-of select="Options/Frame/@cost"/></xsl:attribute>
                        <xsl:attribute name="data-cost"><xsl:value-of select="Options/Frame/@cost"/></xsl:attribute>
                        <xsl:attribute name="class">price</xsl:attribute>
                    </input>
                </td>               

            </xsl:template>

            </xsl:stylesheet>';
$xsl->loadXML($xslstr);

// Configure the transformer
$proc = new XSLTProcessor;
$proc->importStyleSheet($xsl);

// Transform XML source
$newXml = $proc->transformToXML($xml);
echo $newXml;                                   // STRING VALUE

Output

<html>
  <h2>Gallery Wrap</h2>
  <table>
    <tr>
      <th/>
      <th>Name</th>
      <th>Your Cost</th>
      <th>Set-Price</th>
    </tr>
    <tr>
      <td>
        <input type="checkbox" value="12x18_12framewrapwalnut"/>
      </td>
      <td>12x18 Walnut Framed Gallery Wrap-Gallery Wrap</td>
      <td>86</td>
      <td>
        <input type="text" size="5" value="86" data-cost="86" class="price"/>
      </td>
    </tr>
  </table>
</html>

HTML Output from PHP Script