phpjsondecoding

Error while sorting decoded json: "Uncaught TypeError: ksort(): Argument #1 ($array) must be of type array, stdClass given"

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){...}

Here's my error message:

Uncaught TypeError: ksort(): Argument #1 ($array) must be of type array, stdClass given

Solution

  • ksort works with arrays, not with objects. You need to pass true as the second parameter to get an associative array:

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