oxygen-search-condition.php

<?php
/**
 * Oxygen helper class to define when to display search results.
 *
 * @package scorpiotek-wordpress-utilities
 */

namespace ScorpioTek\WPUtil\Oxygen;

class SearchAssist {
	/**
	 * Initialises the condtition to show up in Oxygen's interface and assigns
	 * the callback function.
	 */
	public function __construct() {
		if( function_exists( 'oxygen_vsb_register_condition' ) ) {
			global $oxy_condition_operators;

			oxygen_vsb_register_condition(
				'Has Results',
				array(
					'options' => array(
						'true',
						'false',
					),
					'custom'  => false,
				),
				array(
					'==',
				),
				array(
					$this,
					'search_has_results_callback',
				),
				'Search'
			);
		}
	}
	
	/**
	 * Callback function to figure out if the search yielded any results.
	 *
	 * @param  mixed $value    - the value of the search, only false if nothing was found.
	 * @param  mixed $operator - the operator to use for comparison.
	 * @return void
	 */
	function search_has_results_callback( $value, $operator ) {
		global $wp_query;
		$posts_found = $wp_query->found_posts;
		if ( 'true' === $value && $posts_found > 0 ) {
			return true;
		} elseif( 'false' === $value && 0 === $posts_found ) {
			return true;
		}
	}
}