php foreach的XML提取未循环

Question

I'm trying to make this loop, but it is only returning the first values.

XML

<catalog>
<dd>
    <categoryassignment categoryid="3d-magic" productid="000000000000109330_PURPLE/ BLUE"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000109330_PURPLE/ BLUE/ ORANGE"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000109330_RED/ GREEN/ YELLOW"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000109335_BLUE/YELLOW"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000109335_PURPLE/ORANGE"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000115881_GREEN/PURPLE"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000115881_ORANGE/BLUE"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000115881_RED/YELLOW"/>

    <categoryassignment categoryid="3d-magic" productid="000000000109329001"/>

    <categoryassignment categoryid="3d-magic" productid="000000000109329002"/>

    <categoryassignment categoryid="3d-magic" productid="000000000109335001"/>

    <categoryassignment categoryid="3d-magic" productid="000000000111568001"/>

    <categoryassignment categoryid="3d-magic" productid="000000000111568002"/>
</dd>

PHP

$xml=simplexml_load_file("store.xml") or die("Failed to create an object");

foreach($xml->children() as $books) { 
echo $books->categoryassignment['categoryid'];echo $books->categoryassignment['productid'];echo "<br>";}

From the example here: https://www.w3schools.com/php/php_xml_simplexml_get.asp

Answer 1

You'll need to change how you are referencing the data. If you first do a quick debug by doing:

print_r($xml);

You will see that you have an object like this:

SimpleXMLElement Object
(
    [dd] => SimpleXMLElement Object
        (
            [categoryassignment] => Array
                (
                    [0] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (
                                    [categoryid] => 3d-magic
                                    [productid] => 000000000000109330_PURPLE/ BLUE
                                )
                        )
                    [1] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (
                                    [categoryid] => 3d-magic
                                    [productid] => 000000000000109330_PURPLE/ BLUE/ ORANGE
                                )
                        )
         ... etc ...

With this knowledge, you can then easily see where you need to put your foreach . It would be like this (with a slight change to $books inside):

foreach($xml->dd->categoryassignment as $books) { 
    echo $books['categoryid'];
    echo ' ';
    echo $books['productid'];
    echo "<br>\n";
}

And that results as:

 3d-magic 000000000000109330_PURPLE/ BLUE 3d-magic 000000000000109330_PURPLE/ BLUE/ ORANGE 3d-magic 000000000000109330_RED/ GREEN/ YELLOW 3d-magic 000000000000109335_BLUE/YELLOW 3d-magic 000000000000109335_PURPLE/ORANGE 3d-magic 000000000000115881_GREEN/PURPLE 3d-magic 000000000000115881_ORANGE/BLUE 3d-magic 000000000000115881_RED/YELLOW 3d-magic 000000000109329001 3d-magic 000000000109329002 3d-magic 000000000109335001 3d-magic 000000000111568001 3d-magic 000000000111568002