Add ability to search limited timeframe

[david-binda]

This PR is adding a new filter for filtering the default value of the date filter and is adding a support for arrays inside the $date_filters array, which in turn allows developers to provide advanced date filtering of the results.

Together with the zoninator_search_args filters, developers could limit the search, by default, to past 60 days only, making the queries on the backend more performant, than the default full table scan search.

Example implementation of default time filtering limited to past 60 days:

add_filter( 'zoninator_advanced_filter_date', function( $date_filters ) {
	return array_merge( (array) $date_filters, array(
		array(
			'value' => 'past60days',
			'label' => 'Past 60 days'
		)
	) );
} );

add_filter( 'zoninator_advanced_filter_date_default', function( $default ) {
	return 'past60days';
} );

add_filter( 'zoninator_search_args', function( $args ) {
	global $zoninator;
	$date = $zoninator->_get_get_var( 'date', '', 'striptags' );
	if ( 'past60days' === $date ) {
		$args['date_query'] = array(
			array(
				'after' => '-60 days'
			)
		);
	}
	return $args;
}, 10 );

[mjangda]

👍

[pkevan]

Looks good

[pkevan]

👍