试图提取simplexml的属性

Question

我有一个看起来像这样的XML文件：

<?xml version="1.0" encoding="ISO-8859-1"?> 
<products> 
    <product sku="CATDJ" type="CAT" vendor="DJ" active="1" on_sale="0" discountable="0"> 
    <name>CATALOGS</name> 
    <short_description><![CDATA[The DJ catalog features 182 pages]]></short_description> 
    <long_description><![CDATA[The DJ catalog features 182 pages.]]></long_description> 
    <price>1.5</price> 
    <stock_quantity>65</stock_quantity> 
    <release_date>2003-05-06T00:00:00-04:00</release_date> 
    <barcode>782421791315</barcode> 
    </product> 
    .... 

我能得到的价格，stock_quatity，和条形码，而不是SKU，主动或贴现数据。

这是我的代码看起来是这样的：

$myinv = simplexml_load_file('http://www.*******.com/products.xml'); 
    foreach ($myinv as $invinfo): 
    $sku = $invinfo->products->product->sku; 
    $active = $invinfo->products->product->active; 
    $deductible = $invinfo->products->product->discountable; 
    $qty=$invinfo->stock_quantity; 
    $price=$invinfo->price; 
    $upc=$invinfo->barcode; 

我到底做错了什么？顺便说一句，我是新来的PHP。

谢谢你的帮助。

Answer 1

XPath可以完成获取属性值$xpath->query("//product[@name='sku']/@value");的工作。

Answer 2

我总是对从SimpleXML获得的所有东西进行类型转换，因为它总是返回一个SimpleXMLElement。 var_dump你的变量来看你自己。

<?php 

$xml = '<?xml version="1.0" encoding="ISO-8859-1"?> 
<products> 
    <product sku="CATDJ" type="CAT" vendor="DJ" active="1" on_sale="0" discountable="0"> 
    <name>CATALOGS</name> 
    <short_description><![CDATA[The DJ catalog features 182 pages]]></short_description> 
    <long_description><![CDATA[The DJ catalog features 182 pages.]]></long_description> 
    <price>1.5</price> 
    <stock_quantity>65</stock_quantity> 
    <release_date>2003-05-06T00:00:00-04:00</release_date> 
    <barcode>782421791315</barcode> 
    </product> 
</products>'; 

$myinv = new SimpleXMLElement($xml); 

$products = $myinv->product; 
foreach ($products as $product){ 

    $attrs = $product->attributes(); 
    $sku = $attrs->sku; 
    $active = $attrs->active; 
    $discountable = $attrs->discountable; 
    $qty = $product->stock_quantity; 
    $price = $product->price; 
    $upc = $product->barcode; 

    echo (string)$sku . "<br>\n"; 
    echo (string)$active . "<br>\n"; 
    echo (string)$discountable . "<br>\n"; 
    echo (string)$qty . "<br>\n"; 
    echo (string)$price . "<br>\n"; 
    echo (string)$upc . "<br>\n"; 
} 
?>