dAmntoken grabber using PHP

PHP Token Grabber

<?php
	// Set vars
	$os = PHP_OS;
	$cid= 21;
	$csecret= "dba44bb59a5b303dd3d66a13e3cd4665";
	
	// OS Check for browser opening
	if($os == "Darwin") {	
		exec("open 'https://www.deviantart.com/oauth2/draft15/authorize?client_id=".$cid."&redirect_uri=http://damnapp.com/apicode.php&response_type=code'");
	} elseif($os == "WINNT") {
		exec("start 'https://www.deviantart.com/oauth2/draft15/authorize?client_id=".$cid."&redirect_uri=http://damnapp.com/apicode.php&response_type=code'");
	} elseif($os == "Linux") {
		exec("browser 'https://www.deviantart.com/oauth2/draft15/authorize?client_id=".$cid."&redirect_uri=http://damnapp.com/apicode.php&response_type=code'");
 	} else {
 		echo "Could not open your browser to the required URL. Please load the below one!\r\n";
 		echo 'https://www.deviantart.com/oauth2/draft15/authorize?client_id=".$cid."&redirect_uri=http://damnapp.com/apicode.php&response_type=code';
 	}
	// Retreiving the code
	echo "Enter the code:\r\n";
	$code = trim(fgets(STDIN));
	
	// Getting the access token.
	$curl_handle=curl_init();
	curl_setopt($curl_handle,CURLOPT_URL,'https://www.deviantart.com/oauth2/draft15/token?client_id='.$cid.'&redirect_uri=http://damnapp.com//apicode.php&grant_type=authorization_code&client_secret='.$csecret.'&code='.$code);
	curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, 1);
	$buffer = curl_exec($curl_handle);
	curl_close($curl_handle);
	$bufferArr = json_decode($buffer);
	$token= $bufferArr->access_token;
	
	
	// Authtoken
	$curl_handle2=curl_init();
	curl_setopt($curl_handle2,CURLOPT_URL,'https://www.deviantart.com/api/draft15/user/damntoken?access_token='.$token);
	curl_setopt($curl_handle2, CURLOPT_RETURNTRANSFER, 1);
	$buffer = curl_exec($curl_handle2);
	curl_close($curl_handle2);
	$authtoken = json_decode($buffer);
	
	// Username
	$curl_handle3=curl_init();
	curl_setopt($curl_handle3,CURLOPT_URL,'https://www.deviantart.com/api/draft15/user/whoami?access_token='.$token);
	curl_setopt($curl_handle3, CURLOPT_RETURNTRANSFER, 1);
	$buffer = curl_exec($curl_handle3);
	curl_close($curl_handle3);
	$username = json_decode($buffer);
	echo "\r\n\r\nYou are " . $username . " and your authtoken is: " . $authtoken . ", while your access token for the API is: " . $token . "\r\n";
?>