PHP - Get Geocode (lat, long) from Address

PHP-Get-Geocode-from-Address

<?php

$address = 'avenida+gustavo+paiva,maceio,alagoas,brasil';

$geocode = file_get_contents('http://maps.google.com/maps/api/geocode/json?address='.$address.'&sensor=false');

$output= json_decode($geocode);

$lat = $output->results[0]->geometry->location->lat;
$long = $output->results[0]->geometry->location->lng;

?>  

i get some error for this code. can you help me please

Notice: Undefined offset: 0 in C:\xampp\htdocs\maps\index.php on line 10
Notice: Trying to get property of non-object in C:\xampp\htdocs\maps\index.php on line 10
Notice: Trying to get property of non-object in C:\xampp\htdocs\maps\index.php on line 10
Notice: Trying to get property of non-object in C:\xampp\htdocs\maps\index.php on line 10
Notice: Undefined offset: 0 in C:\xampp\htdocs\maps\index.php on line 11
Notice: Trying to get property of non-object in C:\xampp\htdocs\maps\index.php on line 11
Notice: Trying to get property of non-object in C:\xampp\htdocs\maps\index.php on line 11
Notice: Trying to get property of non-object in C:\xampp\htdocs\maps\index.php on line 11

Now It require api key.
Is there any Way to get lat long from address for free?

Now It require api key.
Is there any Way to get lat long from address for free?

Use OSM.