PHP JSON Array / JSON Object Manipulation

<?php

// JSON String to JSON Array
$json_array = json_decode($json, true);

// Remove an field item from JSON Array
unset($json_array['Address']);

// Add a field item to existing JSON Array
$date_item = array("Date", date("Y-m-d H:i:s");
$new_json_array = array_merge($json_array, $date_item);