Online PHP editor | refs for 64QF4

<?php $a = [ "id"=> "1", "uid"=> NULL, "email"=> "email@gmail.com", "first_name"=> "Andrés", "last_name"=> "Last Namé", "location"=> "Dirección 1234 (Chaco)", "phone"=> "1234567890", "date_created"=> "2014-03-07 15:25:43", "date_modified"=> "2014-03-07 15:25:43" ]; echo json_encode($a);