<?php
	define('VK_APP_ID', '');
	define('VK_APP_SECRET', '');
	
	$ch = curl_init();
	curl_setopt_array($ch, array(
		CURLOPT_USERAGENT => "Ololo", 
		CURLOPT_RETURNTRANSFER => true, 
		CURLOPT_HEADER => false
	));
	
	$vk_redirect_uri = 'http://zhumarin.ru/api_test/vk.php';
	if (!isset($_GET['code'])) {
		$oauth_url = url(
			'https://oauth.vk.com/authorize', 
			array(
				'client_id'     => VK_APP_ID, 
				'scope'         => 'notify friends photos audio video docs notes pages status offers questions groups notifications stats ads offline nohttps', 
				'display'       => '', 
				'response_type' => 'code', 
				'redirect_uri'  => $vk_redirect_uri
			)
		); 
		header("Location: ".$oauth_url); 
	} else {
		$res = request($ch, 'https://oauth.vk.com/access_token', array(
			'client_id'     => VK_APP_ID, 
			'client_secret' => VK_APP_SECRET, 
			'grant_type'    => 'authorization_code', 
			'code'          => $_GET['code'], 
			'redirect_uri'  => $vk_redirect_uri
		)); 
		$data = json_decode($res, true); 
		if (is_array($data) && isset($data['access_token'])) {
			var_export($data);
		} else {
			echo 'Error: <pre>'.htmlspecialchars($res).'</pre>'; 
		}
	}
	
	function url($path, $args, $html = false) {
		$url = $path.'?'.http_build_query($args, '', '&'); 
		return $html ? htmlspecialchars($url) : $url; 
	}
	
	function request($ch, $url, $data = array()) {
		curl_setopt($ch, CURLOPT_URL, $url);
		
		if ($data) {
			curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
			curl_setopt($ch, CURLOPT_POST, true);
		}
		$data = curl_exec($ch);
		curl_setopt($ch, CURLOPT_POST, false);
		
		return $data;
	}