Co-Author Automatic Detect Nearby Author

  • Hi.

    I would like to know if there is something like or similar to this in WordPress.

    The point is, I want my WordPress posts to have more than one owner or author, you could say.

    But my website would function as home service providers.
    So what I would like is that automatically when a person fills for example “a form” in said post. Automatically detect which of all the owners of the post has the closest address in our database.

    Is there any way I can do this?

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  • Hi @aleperix. The easiest way I can think of to do something like this would be to install a plugin like Advanced Custom Fields.

    First, set up a ‘Owners’ field with ‘Type = User’ and ‘Select multiple values? = Yes’. Show this when ‘Post type = post’.

    Then, set up a ‘Location’ field with Type = Google Map. Show this when ‘User form’ = ‘Add / Edit’.

    Now write some custom code in the post template that loops through all of the post’s owners and selects the one that is nearest to a given address.

    $origin = array( 'lat' => -33.865143, 'lng' => 151.209900 );
$owners = get_field( 'owners' );
foreach ( $owners as $owner ) {
	$location = get_field( 'location', 'user_' . $owner->ID );
	$distance = haversineGreatCircleDistance( $origin['lat'], $origin['lng'], $location['lat'], $location['lng'] );
	if ( ! isset( $nearest_distance ) || $distance < $nearest_distance ) {
		$nearest_distance = $distance;
		$nearest_owner = $owner;
	}
}

// From https://stackoverflow.com/a/10054282
function haversineGreatCircleDistance(
  $latitudeFrom, $longitudeFrom, $latitudeTo, $longitudeTo, $earthRadius = 6371000)
{
  // convert from degrees to radians
  $latFrom = deg2rad($latitudeFrom);
  $lonFrom = deg2rad($longitudeFrom);
  $latTo = deg2rad($latitudeTo);
  $lonTo = deg2rad($longitudeTo);

  $latDelta = $latTo - $latFrom;
  $lonDelta = $lonTo - $lonFrom;

  $angle = 2 * asin(sqrt(pow(sin($latDelta / 2), 2) +
    cos($latFrom) * cos($latTo) * pow(sin($lonDelta / 2), 2)));
  return $angle * $earthRadius;
}

printf( 'The nearest owner is: %s', $nearest_owner->display_name );
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