sort xml div by child node PHP SimpleXML

so I have a list of <div>'s in an xml file. I'm parsing the file using php's simpleXML

I can generate an array of all the divs with the following:

$divArray = $xmldoc->text->body->children();

But now I would like to order the $divArray by different childNodes (author, title, date) within the div.

The div looks like this.

<div>
    <bibl>
       <author>
       <title>
       <date>
   </bibl>
</div>

So how can I take $divArray and sort it by <author> or <title> or <date>?

Thanks for your help. jw

The basic procedure is

cast a SimpleXMLElement into an array
write a comparison function that accepts two SimpleXMLElement arguments
sort the array with the comparison function using usort()

I can only guess at your original XML structure, but I think it looks something like this:

$xml = <<<EOT
<root>
<text>
    <body>
        <div>
            <bibl>
                <author>A</author>
                <title>A</title>
                <date>1</date>
            </bibl>
        </div>
        <div>
            <bibl>
                <author>B</author>
                <title>B</title>
                <date>2</date>
            </bibl>
        </div>
        <div>
            <bibl>
                <author>D</author>
                <title>D</title>
                <date>4</date>
            </bibl>
        </div>
        <div>
            <bibl>
                <author>C</author>
                <title>C</title>
                <date>3</date>
            </bibl>
        </div>
    </body>
</text>
</root>
EOT;

$xmldoc = new SimpleXMLElement($xml);

Step 1: Cast to array. Note that your $divArray is not actually an array!

$divSXE = $xmldoc->text->body->children(); // is a SimpleXMLElement, not an array!
// print_r($divSXE);
$divArray = array();
foreach($divSXE->div as $d) {
    $divArray[] = $d;
}
// print_r($divArray);

Step 2: write a comparison function. Since the array is a list of SimpleXMLElements, the comparison function must accept SimpleXMLElement arguments. SimpleXMLElements need explicit casting to get string or integer values.

function author_cmp($a, $b) {
    $va = (string) $a->bibl->author;
    $vb = (string) $b->bibl->author;
    if ($va===$vb) {
        return 0;
    }
    return ($va<$vb) ? -1 : 1;
}

Step 3: Sort the array with usort()

usort($divArray, 'author_cmp');
print_r($divArray);

sort xml div by child node PHP SimpleXML

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