PHP：按键排序JSON数据

Question

I want to sort a single line of JSON data by the keys alphabetically using PHP. So in the end:

{"one":"morning","two":"afternoon","three":"evening","four":"night"}

becomes:

{"four":"night","one":"morning","three":"evening","two":"afternoon"}

I've tried using ksort to no avail:

$icons = json_decode(file_get_contents("icons.json"));
ksort($icons);
foreach($icons as $icon => $code){...}

Answer 1

ksort works with arrays, not with strings:

$array = json_decode($json, true);
ksort($array);
echo json_encode($array);