<?php
$input = <<<'XML'
<?xml version="1.0" encoding="UTF-8"?>
<apps>
<app id="1">
   <name>Blah</name>
   <price locale="sv">19.31</price>
   <price locale="no">16.39</price>
   <price locale="da">15.65</price>
   <price locale="all">2.12</price>
</app>
</apps>
XML;
$xml = new SimpleXMLElement($input);
$apps = array();

foreach ($xml as $node) {
    $app = array('name' => (string)$node->name, 'price' => array());

    foreach ($node->price as $price) {
        $locale = (string)$price['locale'];
        $app['price'][$locale] = (float)$price;
    }

    array_push($apps, $app);
}