如何基于php中的一个键值对JSON对象进行排序和显示

Question

I receive data by JSON and I can read the data and show it by the icons in one big list how they were received. What I want to do is sort the objects by price and display them as icons in two columns on a page.

In one column the free items (price = 0) and in the other column the paid items (price > 0)

I assume I have to use usort (which I don't really understand), but I have no idea, how it would be placed into my existing code and how I could create the divs to show the icons in two columns left and right.

This is my simplified code right now:

$arr = json_decode($jsondata,true);

    if ($arr['resultCount'] > '0') {

    foreach($arr['results'] as $item) {
        $icon = $item['artwork'];
        $title = $item['trackName'];
        $price = $item['price'];

        if ($price == 0 ) {

        echo '<div class="iconsearch" style="background-image: url('.$icon.');"><a href="'.$title.'">'.$title.'<img src="images/iconmask.png"/></a></div>';
        } else {
        echo '<div class="iconsearch" style="background-image: url('.$icon.');"><a href="'.$title.'">'.$title.'<img src="images/iconmask.png"/></a></div>';
        }
    }
}

Answer 1

you need to sort the results coming in. For this you should use usort and provide your own functionality:

usort — Sort an array by values using a user-defined comparison function

try the following:

if ($arr['resultCount'] > 0) {

    usort($arr['results'], function ($a, $b) {
        return $a["price"] > $b["price"];
    });

    var_dump($arr['results']);

    //.. now that its sorted, you can iterate and do as you wish

}

source: http://php.net/manual/en/function.usort.php