Geocode an address, passed as array params

geocode.php

<?php
/**
 * Geocode an address.
 *
 * @param   mixed  $params  Array containing address info or string address.
 *
 * @return  array  Array of longitude or latitude data.
 */
function getLatLng($params)
{
	static $locations = array();
	
	$store = md5(json_encode($params));

	if (!isset($locations[$store]))
	{
		if (is_object($params))
		{
			$params = get_object_vars($params);
		}

		if (is_array($params))
		{	
			$tmp = array();

			$tmp[] = (isset($params['address1'])) ? $params['address1'] : $params['address'];
			$tmp[] = $params['city'];
			$tmp[] = $params['state'];
			$tmp[] = $params['zip'];

			$address = implode(',', $tmp);
		}
		else
		{
			$address = $params;
		}

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

		$output = json_decode($geocode);

		if ($geocode === false || $output === null || $output->status == 'ZERO_RESULTS')
		{
			$lat = 0;
			$lng = 0;
		}
		else
		{
			$lat = $output->results[0]->geometry->location->lat;
			$lng = $output->results[0]->geometry->location->lng;
		}

		$locations[$store] = array('latitude' => $lat, 'longitude' => $lng);
	}

	return $locations[$store];
}