Question

 [
        {
            "id": "123",
            "name": "aaa"
        },
        {
            "id": "567",
            "name": "bbb"
        },
        {
            "id": "469",
            "name": "ccc"
        },
        {
            "id": "577",
            "name": "ddd"
        },
        {
            "id": "388",
            "name": "eee"
        }
]

How to make a order when json decode?

$data = json_decode($json);
foreach ($data as $row) {    
    sort($row)?
}

I need all the decode data make an order by id.

Final data output: "name": "aaa", "name": "eee", "name": "ccc", "name": "bbb", "name": "ddd"

Answer 1

You could use usort().

$data = json_decode($json);
usort($data, function($a, $b) {
    if ($a->id == $b->id) {
        return 0;
    }
    return $a->id < $b->id ? -1 : 1;
});

Or, if you’re using PHP < 5.3, you need to define the comparison function, since the support for anonymous functions was added in PHP 5.3.

function cmp($a, $b) {
    if ($a->id == $b->id) {
        return 0;
    }
    return $a->id < $b->id ? -1 : 1;
}
$data = json_decode($json);
usort($data, 'cmp');

This would sort the array. After that, if you want to create an array with only the name values, you could do that with a foreach.

$result = array();
foreach ($data as $entry) {
    $result[] = array('name' => $entry->name);
}

The $result variable will now contain:

array(array('name' => 'aaa'),
      array('name' => 'eee'),
      array('name' => 'ccc'),
      array('name' => 'bbb'),
      array('name' => 'ddd'));

Then, to encode the result as JSON again, you can call json_encode().

echo json_encode($result);

This will output a string similar to:

[{"name": "aaa"},
 {"name": "eee"},
 {"name": "ccc"},
 {"name": "bbb"},
 {"name": "ddd"}]