$myObj2 = array("Peter"=>35, "Ben"=>37, "Joe"=>43);
echo json_encode($myObj2);



class Emp {
	public $name = "";
	public $age  = "";
	public $city = "";
}
$myObj = new Emp();
$myObj->name = "John";
$myObj->age = 30;
$myObj->city = "New York";

$myJSON = json_encode($myObj);
echo $myJSON;

輸出：
{“Peter”:35,”Ben”:37,”Joe”:43}
{“name”:”John”,”age”:30,”city”:”New York”}