PHP - Function for getting Long and Lat from Google & a function for calculating distance between two Lat and Longs

gistfile1.txt

function getLatLong ( $postcode )
{
	$pc = preg_replace ( '/\s/', '', $postcode );
	
	$pc = 'http://maps.google.com/maps/geo?q='.$pc.',+UK&output=csv&sensor=false';
	
	$result = explode ( ",", file_get_contents ( $pc ) );
	
	return array ( $result[ 2 ], $result[ 3 ] ); 
}
	

function getDistance( $custlat1, $custlong1, $lat, $long ) 
{
	$distance = 4;
	
	$pi80 = M_PI / 180;
	$custlat1 *= $pi80;
	$custlong1 *= $pi80;
	$lat *= $pi80;
	$long *= $pi80;
	$r = 6372.797; 
	$dlat = $custlat1 - $lat;
	$dlng = $custlong1 - $long;
	$a = sin( $dlat / 2 ) * sin( $dlat / 2 ) + cos( $custlat1 ) * cos( $lat ) * sin( $dlng / 2 ) * sin( $dlng / 2 );
	$c = 2 * atan2 ( sqrt( $a ), sqrt( 1 - $a ) );
	
	// Distance in KM so we can work out the milage
	$km = round( $r * $c, 2 );
	
	// Now we have the distance in miles
	$miles = round( $km * 0.621371192, 2 );
	
	return $miles;
}