WordPress plugin: Geo Query

Description

This plugin adds a support for the geo_query part of the WP_Query and WP_User_Query.

Supports geo data stored in post/user meta or in a custom table.

It uses the Haversine SQL implementation by Ollie Jones (see here).

The plugin works on PHP 5.3+.

It supports the GitHub Updater.

Activate the plugin and you can use the geo_query parameter in all your WP_Query and WP_User_Query queries.

Few examples are here below, e.g. for the Rest API.

Installation

Upload the plugin to the plugin folder and activate it.

To install dependencies with Composer (not required):

composer install

or

php composer.phar install

within our folder. See here for more information on how to install Composer.

Then play with the example below, in your theme or in a plugin.

Have fun ;-)

Example - Basic WP_Query usage:

Here's an example of the default input parameters of the geo_query part:

$args = [
    'post_type'           => 'post',    
    'posts_per_page'      => 10,
    'ignore_sticky_posts' => true,
    'orderby'             => [ 'title' => 'DESC' ],
    'geo_query'           => [
        'lat'                =>  64,                                // Latitude point
        'lng'                =>  -22,                               // Longitude point
        'lat_meta_key'       =>  'geo_lat',                         // Meta-key for the latitude data
        'lng_meta_key'       =>  'geo_lng',                         // Meta-key for the longitude data 
        'radius'             =>  150,                               // Find locations within a given radius (km)
        'order'              =>  'DESC',                            // Order by distance
        'distance_unit'      =>  111.045,                           // Default distance unit (km per degree). Use 69.0 for statute miles per degree.
        'context'            => '\\Birgir\\Geo\\GeoQueryHaversine', // Default implementation, you can use your own here instead.
    ],
];
$query = new WP_Query( $args );

Example - Rest API usage:

Here's a modified example from @florianweich:

add_filter( 'rest_query_vars', function ( $valid_vars ) {
	return array_merge( $valid_vars, [ 'geo_location' ] );
} );

add_filter( 'rest_post_query', function( $args, $request ) {
	$geo = json_decode( $request->get_param( 'geo_location' ) );
	if ( isset( $geo->lat, $geo->lng ) ) {
		$args['geo_query'] = [
			'lat'                =>  (float) $geo->lat,
			'lng'                =>  (float) $geo->lng,
			'lat_meta_key'       =>  'geo_lat',
			'lng_meta_key'       =>  'geo_lng',
			'radius'             =>  ($geo->radius) ? (float) $geo->radius : 50,
		];
	}
	return $args;
}, 10, 2 );

Test it with e.g.:

https://example.com/wp-json/wp/v2/posts?geo_location={"lat":"64.128288","lng":"-21.827774","radius":"50"}

One can use rest_{custom-post-type-slug}_query filter for a custom post type.

Example - Basic WP_User_Query usage:

Here's an example from @acobster:

$args = [
  'role'      => 'subscriber',
  'geo_query' => [
    'lat'          => 47.236,
    'lng'          => -122.435,
    'lat_meta_key' => 'geo_lat',
    'lng_meta_key' => 'geo_lng',
    'radius'       => 1,
    'context'      => '\\Birgir\\Geo\\GeoQueryUserHaversine',
  ],
];

$query = new WP_User_Query( $args );

Example - Basic WP_Query usage for fetching lat/lng data from a custom table with Haversine formula:

$args = array(
   	'post_type'           => 'post',    
   	'posts_per_page'      => 10,
   	'ignore_sticky_posts' => true,
   	'orderby'             => array( 'title' => 'DESC' ),		    
	'geo_query' => array(
		'table'         => 'custom_table', // Table name for the geo custom table.
		'pid_col'       => 'pid',          // Column name for the post ID data
		'lat_col'       => 'lat',          // Column name for the latitude data
		'lng_col'       => 'lng',          // Column name for the longitude data 
		'lat'           => 64.0,           // Latitude point
		'lng'           => -22.0,          // Longitude point
		'radius'        => 1,              // Find locations within a given radius (km)
		'order'         => 'DESC',         // Order by distance
		'distance_unit' => 111.045,        // Default distance unit (km per degree). Use 69.0 for statute miles per degree.
		'context'       => '\\Birgir\\Geo\\GeoQueryPostCustomTableHaversine', // Custom table implementation, you can use your own here instead.
	),
);

$query = new WP_Query( $args );

Check the unit test method test_custom_table_in_wp_query() as a more detailed example.

Notes on the parameters:

• The plugin assumes we store the latitudes and longitudes as custom fields ( post meta), so we need to tell the query about meta keys with the 'lat_meta_key' and 'lng_meta_key' parameters.

• Skipping the 'radius' parameter means that no distance filtering will take place.

• If we use the 'order' parameter within the 'geo_query', then it will be prepended to the native 'orderby' parameter.

• The 'distance_unit' parameter should be 69.0 for distance in statute miles, else 111.045 for distance in kilometers.

• If we want to use the optimized Haversine version by Ollie Jones, we use:

    'context' => '\\Birgir\\Geo\\GeoQueryHaversineOptimized'
  

  Notice that on our current plugin setup (i.e. fetching data from the LONGTEXT post meta fields) this isn't more performant than the default GeoQueryHaversine class.

  A future work could be to use a custom table with indexes, for the optimization to work.

• If we create our own implementation of the Haversine formula, for example the GeoQueryCustom class, we just have to make sure it implements the GeoQueryInterface interface:

    'context' => 'GeoQueryCustom'
  

Feedback

Any suggestions are welcomed.

Changelog

0.2.0 (2020-04-25)

• Support for fetching points from a custom table and doing Haversine formula in WP_Query.

0.1.1 (2019-01-23)

• Fixed #14. Fixed the user query ordering. Props @baden03

0.1.0 (2018-08-06)

• Added support for user queries. Props @acobster
• Fixed Travis issue. Travis runs successfully for PHP 7.2, 7.1,7,5.6 when installed via Composer and also 5.4 when installed without Composer. Skip the 5.4 Composer check for now.

0.0.7 (2018-06-27)

• Fixed #10. Use ^1.0.0 for composer installer. Props @wujekbogdan

0.0.6 (2017-11-16)

• Fixed #6. Support floating point radius. Props @wujekbogdan
• Added integration tests.

0.0.5 (2017-02-26)

• Added fallback for those that don't use Composer
• Removed the vendor directory

0.0.4 (2017-02-26)

• Fixed #4. Props @billzhong .

0.0.3 (2015-04-29)

• Fixed #2. Fixed a typo. Props @Ben764 and @con322.

0.0.2 (2015-03-10)

• Added: Support for the GitHub Updater.
• Updated: README.md
• Changed: Use distance_value instead of distance_in_km in SQL, since we can use miles by changing the distance_unit parameter.

0.0.1 - Init