Added event onResponse.

[ghost]

Hey,

i added this event-logic on the class, because I found hard to make logging possible.

I do it this way, because I wanted to avoid inheritance as bad practice and composition (via decorator for example) is not easily possible because of missing interface. Also, it would be extremely weird to wrap all those public method in some LoggingInstagramDecorator.

[ghost]

I tested it via this test (if you want to I can add it to repository):

File: tests/OnResponseTest.phpt

<?php

require_once __DIR__ . '/../vendor/autoload.php';

use MetzWeb\Instagram\Instagram;

$apiKey = '';
$token = '';

$logData = [];

$instagram = new Instagram($apiKey);
$instagram->setAccessToken($token);

$instagram->onResponse[] = function ($apiCall, array $params, $method, $jsonData) use (&$logData) {
    $logData = [
        'apiCall' => $apiCall,
        'params' => $params,
        'method' => $method,
        'jsonData' => $jsonData,
    ];
};

$instagram->getUserMedia();

if ($logData['apiCall'] !== 'https://api.instagram.com/v1/users/self/media/recent?access_token=261457396.55621d5.b1763002ff49447d86a1977500c04506&') {
    print_r($logData['apiCall']);
    die ("Assert 'apiCall' FAILED!\n");
}

if ($logData['params'] !== []) {
    print_r($logData['params']);
    die ("Assert 'params' FAILED!\n");
}

if ($logData['method'] !== 'GET') {
    print_r($logData['method']);
    die ("Assert 'params' FAILED!\n");
}

print_r($logData['jsonData']);