复杂循环通过复杂的SimpleXMLElement

Question

I need to save some values from XML.

First step - I get the structure:

 $xml = $dom_xml->saveXML();
 $xml_ = new \SimpleXMLElement($xml);
 dd($xml_);

Here TextFrame has 8 arrays. Each of them has PathPointType, which has 4 more arrays with 3 attributes each. And these attributes I need from each TextFrame.

I can get, for instance, Anchor value doing this:

$res = $xml_
        ->Spread
        ->TextFrame
        ->Properties
        ->PathGeometry
        ->GeometryPathType
        ->PathPointArray
        ->PathPointType
        ->attributes();
    dd($res['Anchor']);

(BTW: is there more prettier way to get it?)

But the question is - how is it possible to loop through all arrays and save values separately for each array?

I assume here has to be a multidimensional foreach loop in conjunction with for loop?

Or is better to achieve it using DOMDocument?

Answer 1

As it looks as though you are starting off with DOMDocument (as you are using $dom_xml->saveXML() to generate the XML), it may be easier to continue using it and it also has some easy features for getting the details your after.

Using getElementsByTagName() allows you to get a list of the elements with a specific tag name from a start point, so starting with $dom_xml, get all of the <TextFrame> elements. Then foreach() over this list and using this element as a start point, use getElementsByTagName("PathPointType") to get the nested <PathPointType> elements. At this point you can then use getAttribute("Anchor") for each of the attributes you need from the <PathPointType> elements...

$textFrames = $dom_xml->getElementsByTagName("TextFrame");

foreach ( $textFrames as $frame )   {
    $pathPointTypes = $frame->getElementsByTagName("PathPointType");
    foreach ( $pathPointTypes as $type )    {
        echo $type->getAttribute("Anchor").PHP_EOL;
    }
}

Edit

You can extend the code to build an array of frames and then the anchors within that. This code also stores the anchor in an associative array so that if you add the other attributes, you can add them here (or remove it if you don't need another layer of detail)...

$frames =[];
foreach ( $textFrames as $frame )   {
    $anchors = [];
    $pathPointTypes = $frame->getElementsByTagName("PathPointType");
    foreach ( $pathPointTypes as $type )    {
        $anchors[] = ['Anchor' => $type->getAttribute("Anchor")];
    }
    $frames[] = $anchors;
}

Also if you have some way of identifying the frames, you could create an associative array at that level as well...

$frames[$frameID] = $anchors;