Legendary Farming

<?php

$legendary = [
    'fragments' => [0, 'Valanyr'],
    'motes' => [0, 'Dragonwrath'],
    'shards' => [0, 'Shadowmourne']
];
$junk = [];
$grind = true;

while ($grind) {
    $items = array_map('strtolower', explode(' ', readline()));

    for ($i = 0; $i < count($items); $i += 2) {
        $quantity = intval($items[$i]);
        $material = $items[$i + 1];

        if ($material === 'fragments' || $material === 'motes' || $material === 'shards') {
            $legendary[$material][0] += $quantity;
            if ($legendary[$material][0] >= 250) {
                echo $legendary[$material][1] . " obtained!" . PHP_EOL;
                $legendary[$material][0] -= 250;
                $grind = false;
                break;
            }
        } else {
            if (!key_exists($material, $junk)) {
                $junk[$material] = 0;
            }
            $junk[$material] += $quantity;
        }
    }
}

uksort($legendary, function ($key1, $key2) use ($legendary) {
    if ($legendary[$key1][0] === $legendary[$key2][0]) {
        return $key1 <=> $key2;
    } else {
        return $legendary[$key2][0] <=> $legendary[$key1][0];
    }
});
ksort($junk);

foreach ($legendary as $item => $quantityLeft) {
    echo $item . ': ' . $legendary[$item][0] . PHP_EOL;
}
foreach ($junk as $item => $quantityJunk) {
    echo $item . ': ' . $junk[$item] . PHP_EOL;
}