📄 trait-singleton.php

<?php
/**
 * Singleton trait.
 *
 * @package wp-job-manager-alerts
 */

namespace WP_Job_Manager;

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

trait Singleton {

	/**
	 * The single instance of the class.
	 *
	 * @var self
	 */
	private static $instance = null;

	/**
	 * Allows for accessing single instance of class. Class should only be constructed once per call.
	 *
	 * @since 2.2.0
	 * @static
	 * @return self Main instance.
	 */
	public static function instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

}