AjaxBase.php

<?php
/**
 * Created by JetBrains PhpStorm.
 * User: amezghal abdelilah
 * Date: 17/09/13
 * Time: 11:08
 */

class AjaxBase {
    public function executeAction($actionName, $arguments = []){
        try{
            $method = new ReflectionMethod($this, $actionName);
            if(!$method->isFinal()){
                throw new Exception("method is not final");
            }
        }catch(Exception $notFoundMethod){
            $errorMessage = "The action << $actionName >> does not exists";
           $this->error($errorMessage);
        }

        $methodArguments = $method->getParameters();
        $requiredArguments = $method->getNumberOfRequiredParameters();

        if(count($arguments) >= $requiredArguments){
            $params = array();
            if(count($methodArguments) > 0){
                foreach($methodArguments as $arg){
                    if(isset($arguments[$arg->getName()])){
                        //todo protect value;
                        $params[] = $arguments[$arg->getName()];
                    }elseif(!isset($arguments[$arg->getName()]) && !$arg->isOptional()){
                        $this->error("Function call, Missing argument << {$arg->getName()} >>, check the function arguments");
                    }
                }
                //before invoking the method we have to order the arguments
                $this->output($method, $params);
            }else{
                $this->output($method);
            }
        }else{
            $this->error("The number of arguments needed to call this function is incorrect. check the function arguments");
        }
    }

    protected function output(ReflectionMethod $method, $params = []){
        $response = $method->invokeArgs($this, $params);
        //output json if is php array, otherwise text/html
        if(is_array($response)){
            $this->utfEncode($response);
            header("Content-type: application/json");
            echo json_encode($response);
        }else{
            header("Content-type: text/html");
            echo $response;
        }
    }

    protected  function error($message){
        exit($message);
    }

    protected function utfEncode(&$var) {
        if (is_array($var) || is_object($var)) {
            foreach ($var as &$token) {
                $this->utfEncode($token);
            }
        } else {
            if (is_string($var)) {
                $currentEncoding = mb_detect_encoding($var);
                if($currentEncoding != 'UTF-8')
                    $var = mb_convert_encoding($var, 'UTF-8', $currentEncoding);
            } elseif (is_null($var)) {
                $var = '';
            }
        }
    }
}