GravityView Maps - Add more radius search options

add-radius-options-to-search.php

<?php

/**
 * Add larger-radius options for geolocation radius search.
 *
 * @param array $options Nested array. `value` key maps to the size of the radius.
 *
 * @return array Modified array of options.
 */
add_filter( 'gk/gravitymaps/geolocation_radius_options', function ( $options ) {
	$additional_options = [
		[ 'value' => 200 ],
		[ 'value' => 300 ],
		[ 'value' => 400 ],
		[ 'value' => 500 ],
		[ 'value' => 750 ],
		[ 'value' => 1000 ],
	];

	return array_merge( $options, $additional_options );
} );