make order in json decode - php

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"}]