PHP递归收集SimpleXMLElement数据并展平数组

Question

Im trying to build an array structure based off of xmldata. I believe the issue has to do with how Im handling $finalData . I eventually want a flattened array containing three arrays of records, but I imagine I need to first parse the XML data correctly and then work on flattening the array of data. I wanted to fix the code to parse the XML data, so my initial question is how do I fix this code to parse the XML data, but then I was going to work on how to flatten the final data array(i need the individual record structures that contain the pertinent information i eventually need. I guess you can say Im trying to handle a user import of data and ultimately retrieve just the individual components that contain the data.

public function processXml($xmldata,$finalData=array())
{
    $finalData = array();
    if($xmldata instanceof SimpleXMLElement){
        foreach($xmldata as $idata){
            $this->processXml($idata,$finalData);
        }
    } else {
        array_push($finalData,$xmldata);
    }
    return $finalData;  
}

Here's the XML Data (note that I do not know what the user will be importing in his XML data, this is just test data that i created):

`<?xml version="1.0" encoding="UTF-8"?>
     <configdata>
        <records>
             <somekey>
                <record>
                    <firstname>Jonathan</firstname>
                    <lastname>Kushner</lastname>
                </record>
                <record>
                    <firstname>Dustin</firstname>
                    <lastname>Kushner</lastname>
                </record>
                <record>
                    <firstname>Cameron</firstname>
                    <lastname>Kushner</lastname>
                </record>
            </somekey>
        </records>
    </configdata>`

NOTE: The answers provided use xpath and domdocument. Im trying to learn recursion and flattening so although it is a better approach, I still wish to figure out how to implement this using just recursion and flattening.

Answer 1

Rather than the recursive loop carpet-bomb approach, it is far better to use XPath to extract only the data you want in a precise way.

Here's how you can acheive what you want:

// Create the document object
$xml = simplexml_load_string($xmlData);

$result = array();

// Get the <record> nodes and loop them
foreach ($xml->xpath('//record') as $record) {
    // to get the text data from a node in SimpleXML, just cast it to a string
    $result[] = array(
        'firstname' => (string) $record->firstname,
        'lastname' => (string) $record->lastname,
    );
}

print_r($result);

See it working

To take all child elements from the $record without knowing it's name, you can use:

$result[] = array_map(
    'strval', 
     iterator_to_array($record->children())
);

Take note that same-names elements (which is possible in XML) will not work in an array. Here only the last element with the same name will survive.

Edit

This can also still be done with XPath but you will need to use DOM instead of SimpleXML (this shouldn't be a problem, it's available everywhere). You can do something like this:

// Create the document object
$doc = new DOMDocument;

// This is required in order to ignore the pretty-print whitspace
$doc->preserveWhiteSpace = false;

// load the data into the object
$doc->loadXML($xmlData);
$xpath = new DOMXpath($doc);

$result = array();

// Get the text nodes and loop them
foreach ($xpath->query('//text()') as $record) {
    $result[] = $record->data;
}

print_r($result);

See it working