PHP: Load a class in a class - php

Question

I have a class which is meant to "load" an another class, however I haven't been able to get it to work.
Error Message
Fatal error: Call to undefined method stdClass::echoString() in C:\Program Files (x86)\EasyPHP-DevServer-14.1VC11\data\localweb\classes\example.php on line 5
Code
My code is broken up into three main sections:
api.php - the class to load the other classes.
API/exampleExternalAPI.php - (multiple files) the classes that api.php loads
example.php - the file that uses the main class (api.php)
If it helps these files can be downloaded from my dropbox
api.php
<?php
/* Config */
define('pathToAPIs','API/');
/* Autoload Function */
spl_autoload_register(function($className){
$namespace=str_replace("\\","/",__NAMESPACE__);
$className=str_replace("\\","/",$className);
$class=pathToAPIs.(empty($namespace)?"":$namespace."/")."{$className}.php";
include_once($class);
});
class api {
private $listOfAPIs;
public $APIs;
public function __construct($setAPI = null){
$this->updateListOfAPIs();
if (isset($setAPI)){
return $this->setAPI($setAPI);
}
}
public function setAPIs($setAPIs){
$this->APIs = null; // clears a previous call to this method
if (!is_array($setAPIs)){ // if not an array
$setAPIs = array($setAPIs); // make array
}
foreach ($setAPIs as $setAPIType){
if(in_array($setAPIType,$this->listOfAPIs)){
$array[$setAPIType] = new $setAPIType;
}
}
$this->APIs = json_decode(json_encode($array), FALSE); // convert array of required api objects to an object
return $this->APIs;
}
public function getListOfAPIs($update = false){
if ($update){
$this->updateListOfAPIs();
}
return $this->listOfAPIs;
}
private function updateListOfAPIs(){
$this->listOfAPIs = null; // clears a previous call to this method
$it = new FilesystemIterator(pathToAPIs);
foreach ($it as $fileinfo){
$filename = pathinfo($fileinfo->getFilename(), PATHINFO_FILENAME); // removes extension
$this->listOfAPIs[]= $filename;
}
}
public function __call($method,$args){
}
}
API/exampleExternalAPI.php
<?php
class exampleExternalAPI {
public function echoString($string){
echo $string;
}
}
example.php
<?php
require_once 'api.php';
$api = new api();
$api->setAPIs('exampleExternalAPI');
$api->APIs->exampleExternalAPI->echoString('string');
Background Info
(may give some insight to my madness)
I'm working on a project where I need to connect to lots of external APIs.
So I decided to creating a class to look after all my communications with external APIs ( not sure if best way - new to Object Oriented Programming).

Answer 1

I'm not entirely sure what problem you're trying to solve, but if your APIs is a simple stdClass instance it should work as expected:
public function setAPIs($setAPIs)
{
$this->APIs = new stdClass; // clears a previous call to this method
if (!is_array($setAPIs)) { // if not an array
$setAPIs = array($setAPIs); // make array
}
foreach ($setAPIs as $setAPIType) {
if (in_array($setAPIType, $this->listOfAPIs)) {
$this->APIs->{$setAPIType} = new $setAPIType;
}
}
return $this->APIs;
}