Setting Latitude and Longitude in Google Maps - undefined results - php

Question

Currently using downloadURL() on home.php that downloads an xml.php file. Creates xml doc from database to display markers on map. Worked fine earlier, but now I'm receiving errors around geoCode/lat/long. Any advice? FireFox error: undefined offset [0] via results.
<?php
include 'connect.php';
if(isset($_SESSION['user_name']))
{
header('Location: home.php');
}
$query = "SELECT `acc_id`,`acc_name`,`acc_address`,acc_zip FROM `account_acc` ";
$result = mysqli_query($connection,$query) or die(mysql_error());
$doc = new DomDocument('1.0');
$node = $doc->createElement("markers");
$parnode = $doc->appendChild($node);
header('Content-type: text/xml');
while($row = mysqli_fetch_array($result))
{
$node = $doc->createElement("marker");
$newnode = $parnode->appendChild($node);
$address = $row['acc_zip'];
$prepAddr = str_replace(' ','+',$address);
$geocode=file_get_contents('https://maps.google.com/maps/api/geocode/json?key=API&address='.$prepAddr);
$output= json_decode($geocode);
$lat = $output->results[0]->geometry->location->lat;
$long = $output->results[0]->geometry->location->lng;
$newnode->setAttribute("name", $row['acc_name']);
$newnode->setAttribute("accid", $row['acc_id']);
$newnode->setAttribute("address", $row['acc_address']);
$newnode->setAttribute("zip", $row['acc_zip']);
$newnode->setAttribute("lat", $lat);
$newnode->setAttribute("long", $long);
}
print $doc->saveXML();
?>

Answer 1

There aren't lat/lng properties of location, they are functions (lat()/lng()).

Answer 2

Most likely you are getting the error undefined offset [0] since the provided address ($address variable) could not be determined and the response contains empty results. For that case Google Maps Geocoding API provides Status Codes:
"OK" indicates that no errors occurred; the address was successfully parsed and at least one geocode was returned.
"ZERO_RESULTS" indicates that the geocode was successful but returned no results. This may occur if the geocoder was passed a
non-existent address.
"OVER_QUERY_LIMIT" indicates that you are over your quota.
"REQUEST_DENIED" indicates that your request was denied.
"INVALID_REQUEST" generally indicates that the query (address, components or latlng) is missing.
"UNKNOWN_ERROR" indicates that the request could not be processed due to a server error. The request may succeed if you try again.
that you could utilize to determine whether address has been resolved.
Example
$geocode = file_get_contents('https://maps.google.com/maps/api/geocode/json?address=' . $prepAddr);
$output = json_decode($geocode);
if($output->status == "OK"){
$lat = $output->results[0]->geometry->location->lat;
$long = $output->results[0]->geometry->location->lng;
//the remaining code goes here...
}