<?php
$xmlstring = <<<XML
<?xml version="1.0" encoding="iso-8859-1" ?>
<tarification compagnie="banane" cle="laclef">
<gamme reference="equilibre-sante">
<tarif formule="f100">Xx.xx</tarif>
<tarif formule="f200">Xx.xx</tarif>
</gamme>
</tarification>
XML;
 
$xml = simplexml_load_string($xmlstring);
                                                                                                                                                                                                               
foreach($xml->gamme->tarif as $tarif) {
        foreach($tarif->attributes() as $a => $b) {
                echo $a,'="',$b,"\"\n";
        }
}
 
?>

formule="f100"
formule="f200"