json_decode example

<?php

$json = '[{
    "user_id": "1",
    "username": "Sandy Corzeta"
}]';

// array of users objects as is in the json code
$users = json_decode($json);

if (null === $users && json_last_error() !== JSON_ERROR_NONE) {
    die('Error decoding json, error code: ' . json_last_error());
}

?>
<div>
 <div id="user_id"><?php echo $users[0]->user_id; ?></div>
 <div id="username"><?php echo $users[0]->username; ?></div>
</div>