RestServer.php

<?php
class RestServer {
  public $global_method;
  public $serviceClass;

  public function __construct($serviceClass,$method) {
  global $METHOD;
    $this->serviceClass = $serviceClass;
    $global_method = $method;
    $METHOD=$method;
  }

  public function handle() {
  global $METHOD;
    // if (array_key_exists("method", array_change_key_case($_REQUEST, CASE_LOWER)))
    if ($global_method == "") {
      $rArray = array_change_key_case($_REQUEST, CASE_LOWER);
      //$method = $rArray["method"];
      $method = $global_method;
      $method = $METHOD;

      if (method_exists($this->serviceClass, $method)) {

        $ref = new ReflectionMethod($this->serviceClass, $method);
        $params = $ref->getParameters();
        $pCount = count($params);
        $pArray = array();
        $paramStr = "";

        $i = 0;

        foreach ($params as $param) {
          $pArray[strtolower($param->getName())] = null;
          $paramStr .= $param->getName();
          if ($i != $pCount-1) {
            $paramStr .= ", ";
          }

          $i++;
        }
        foreach ($pArray as $key => $val) {
          $pArray[strtolower($key)] = $rArray[strtolower($key)];
        }

        if (count($pArray) == $pCount && !in_array(null, $pArray)) {
          echo call_user_func_array(array($this->serviceClass, $method), $pArray);
        }
        else {
          echo json_encode(array('errorMessage' => "Required parameter(s) for ". $method .": ". $paramStr));
        }
      }
      else {
        echo json_encode(array('errorMessage' => "The method " . $method . " does not exist."));
      }
    }
    else {
      echo json_encode(array('errorMessage' => 'No method was requested.'));
    }
  }
}