Sort XML via attribute value PHP

Question

So I have an XML file that I am trying to loop through in order, according to the attribute, \"order\".

Here is an example:

Answer 1

If you have many elements like this

$string = <<











EOS;

You can use foreach:

$xml = simplexml_load_string($string);

function sort_trees($t1, $t2) {
    return $t1['order'] - $t2['order'];
}

foreach($xml->talentTrees as $talentTrees){
    foreach($talentTrees->tree as $tree){
    $trees[]= $tree;
    }
    usort($trees, 'sort_trees');
    print_r($trees);
    unset($trees);
}

output:

Array
(
    [0] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [name] => Baseball
                            [order] => 0
                        )

                )

            [1] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [name] => Frisbee
                            [order] => 1
                        )

                )

            [2] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [name] => Football
                            [order] => 2
                        )

                )

        )

    [1] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [name] => Frisbee2
                            [order] => 0
                        )

                )

            [1] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [name] => Football2
                            [order] => 1
                        )

                )

            [2] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [name] => Baseball2
                            [order] => 2
                        )

                )

        )

)

For another example: https://stackoverflow.com/a/44379495/3506219