<?php
header("content-type:text/html;charset=utf-8");   
$thai_data = '{"employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter", "lastName":"Jones"}
]}';
$data = iconv("tis-620","utf-8",$thai_data);
$data = json_decode($data);
echo "<pre>";
var_dump($data); 
echo "</pre>";
foreach($data as $key => $val) { 
  echo $key . "<br/>";  // employees
    foreach($data->$key as $k1 => $v1) { 
        foreach($v1 as $k2 => $v2) {
          echo "$k2 =  $v2<br/>"; 
        }
    }
}
// http://www.w3schools.com/json/
?>