How to sort SimpleXMLElement on PHP

Question

I want to know how can I sort simple XML elements with PHP. Yes, I found some threads that address the same subject — but I couldn't solve my problem.

The XML what I want to sort is:

<?xml version="1.0" encoding="UTF-8"?>
<cursos>
  <curso>
    <id>DRW</id>
    <nome>Design Responsivo</nome>
    <categoria>Web</categoria>
    <inicio>30/02/2013</inicio>
    <periodo>Sábados de manhã</periodo>
    <cargaHoraria>40h</cargaHoraria>
    <objetivos></objetivos>
  </curso>
  <curso>
    <id>MSQ</id>
    <nome>MySQL</nome>
    <categoria>Banco de dados</categoria>
    <inicio>30/03/2013</inicio>
    <periodo>Sábados de manhã</periodo>
    <cargaHoraria>20h</cargaHoraria>
    <objetivos></objetivos>
  </curso>
  <curso>
    <id>MBY</id>
    <nome>Iniciação à informática</nome>
    <categoria>Iniciantes e Usuários Av.</categoria>
    <inicio>30/04/2013</inicio>
    <periodo>Matutino 1</periodo>
    <cargaHoraria>80h</cargaHoraria>
    <objetivos></objetivos>
  </curso>
  <curso>
    <id>FCS</id>
    <nome>Desenvolvendo em C#</nome>
    <categoria>Desenvolvimento</categoria>
    <inicio>14/04/2013</inicio>
    <periodo>Domingo</periodo>
    <cargaHoraria>60h</cargaHoraria>
    <objetivos></objetivos>
  </curso>
  <curso>
    <id>MAY</id>
    <nome>Modelagem em Maya</nome>
    <categoria>Artes gráficas</categoria>
    <inicio>13/04/2013</inicio>
    <periodo>Sábado 08h:00-13h:00</periodo>
    <cargaHoraria>60h</cargaHoraria>
    <objetivos></objetivos>
  </curso>
</cursos>

I found this and this solution, but the logic to apply this on multidimensional XML array is not clearly for me. Can someone help me?

Thanks in advance.

Please post the code that you tried to use and the errors/problems you have with it. — Tomalak, Apr 01 '13 at 15:19

score 2 · Accepted Answer · answered Apr 01 '13 at 15:30

There's no real easy way to sort using SimpleXML; you would have to create an array with the elements, sort them and then reconstruct the XML:

$d = simplexml_load_string($xml);
// turn into array
$e = array();
foreach ($d->curso as $curso) {
        $e[] = $curso;
}
// sort the array
usort($e, function($a, $b) {
        return $a->cargaHoraria - $b->cargaHoraria;
});
// put it back together
echo '<cursos>';
foreach ($e as $node) {
        echo $node->saveXML();
}
echo '</cursos>';

+1 Though I would recommend not putting it back together as a string. This is better: http://stackoverflow.com/a/3361590/18771 — Tomalak, Apr 01 '13 at 17:06

How to sort SimpleXMLElement on PHP

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